diff --git a/src/helpers/schedulers.ts b/src/helpers/schedulers.ts
index 76e6920c..5d6bd335 100644
--- a/src/helpers/schedulers.ts
+++ b/src/helpers/schedulers.ts
@@ -20,14 +20,14 @@ export function debounce<F extends AnyToVoidFunction>(
       fn(...args);
     }
 
-    waitingTimeout = window.setTimeout(() => {
+    waitingTimeout = setTimeout(() => {
       if(shouldRunLast) {
         // @ts-ignore
         fn(...args);
       }
 
       waitingTimeout = null;
-    }, ms);
+    }, ms) as any;
   };
 }
 
diff --git a/src/lib/logger.ts b/src/lib/logger.ts
index 5a15796f..dbe4d4a4 100644
--- a/src/lib/logger.ts
+++ b/src/lib/logger.ts
@@ -1,4 +1,4 @@
-//import { DEBUG } from "./mtproto/mtproto_config";
+import { DEBUG } from "./mtproto/mtproto_config";
 
 export enum LogLevels {
   log = 1,
@@ -13,7 +13,7 @@ function dT() {
 }
 
 export function logger(prefix: string, level = LogLevels.log | LogLevels.warn | LogLevels.error) {
-  if(process.env.NODE_ENV !== 'development'/*  || true */) {
+  if(!DEBUG/*  || true */) {
     level = LogLevels.error;
   }
 
diff --git a/src/lib/mtproto/apiFileManager.ts b/src/lib/mtproto/apiFileManager.ts
index 3abb4d79..987f588b 100644
--- a/src/lib/mtproto/apiFileManager.ts
+++ b/src/lib/mtproto/apiFileManager.ts
@@ -9,7 +9,7 @@ import FileManager from "../filemanager";
 import { logger, LogLevels } from "../logger";
 import apiManager from "./apiManager";
 import { isWebpSupported } from "./mtproto.worker";
-import { MOUNT_CLASS_TO } from "./mtproto_config";
+import { DEBUG, Modes, MOUNT_CLASS_TO } from "./mtproto_config";
 
 
 type Delayed = {
@@ -59,9 +59,10 @@ export class ApiFileManager {
 
   public webpConvertPromises: {[fileName: string]: CancellablePromise<Uint8Array>} = {};
 
-  private log: ReturnType<typeof logger> = logger('AFM', LogLevels.error);
+  private log: ReturnType<typeof logger> = logger('AFM', LogLevels.error | LogLevels.log);
   private tempId = 0;
   private queueId = 0;
+  private debug = Modes.debug;
 
   public downloadRequest(dcId: 'upload', id: number, cb: () => Promise<void>, activeDelta: number, queueId?: number): Promise<void>;
   public downloadRequest(dcId: number, id: number, cb: () => Promise<MyUploadFile>, activeDelta: number, queueId?: number): Promise<MyUploadFile>;
@@ -138,8 +139,6 @@ export class ApiFileManager {
   }
 
   public requestFilePart(dcId: number, location: InputFileLocation | FileLocation, offset: number, limit: number, id = 0, queueId = 0, checkCancel?: () => void) {
-    //const delta = limit / 1024 / 256;
-    const delta = limit / 1024 / 128;
     return this.downloadRequest(dcId, id, async() => {
       checkCancel && checkCancel();
 
@@ -151,13 +150,17 @@ export class ApiFileManager {
         dcId,
         fileDownload: true
       }) as Promise<MyUploadFile>;
-    }, delta, queueId);
+    }, this.getDelta(limit), queueId);
   }
 
   /* private convertBlobToBytes(blob: Blob) {
     return blob.arrayBuffer().then(buffer => new Uint8Array(buffer));
   } */
 
+  private getDelta(bytes: number) {
+    return bytes / 1024 / 128;
+  }
+
   private getLimitPart(size: number): number {
     let bytes: number;
 
@@ -205,7 +208,7 @@ export class ApiFileManager {
     const cachedPromise = this.cachedDownloadPromises[fileName];
     const fileStorage = this.getFileStorage();
 
-    this.log('downloadFile', fileName, size, location, options.mimeType, process);
+    this.debug && this.log('downloadFile', fileName, size, location, options.mimeType);
 
     /* if(options.queueId) {
       this.log.error('downloadFile queueId:', fileName, options.queueId);
@@ -217,7 +220,7 @@ export class ApiFileManager {
       if(size) {
         return cachedPromise.then((blob: Blob) => {
           if(blob.size < size) {
-            this.log('downloadFile need to deleteFile, wrong size:', blob.size, size);
+            this.debug && this.log('downloadFile need to deleteFile, wrong size:', blob.size, size);
 
             return this.deleteFile(fileName).then(() => {
               return this.downloadFile(options);
@@ -313,7 +316,7 @@ export class ApiFileManager {
               superpuper();
             }
 
-            this.log('downloadFile requestFilePart result:', fileName, result);
+            this.debug && this.log('downloadFile requestFilePart result:', fileName, result);
             const isFinal = offset + limit >= size || !bytes.byteLength;
             if(bytes.byteLength) {
               //done += limit;
@@ -390,20 +393,19 @@ export class ApiFileManager {
     let canceled = false,
       resolved = false,
       doneParts = 0,
-      partSize = 262144, // 256 Kb
-      activeDelta = 2;
+      partSize = 262144; // 256 Kb
 
     /* if(fileSize > (524288 * 3000)) {
       partSize = 1024 * 1024;
       activeDelta = 8;
     } else  */if(fileSize > 67108864) {
       partSize = 524288;
-      activeDelta = 4;
     } else if(fileSize < 102400) {
       partSize = 32768;
-      activeDelta = 1;
     }
 
+    const activeDelta = this.getDelta(partSize);
+
     const totalParts = Math.ceil(fileSize / partSize);
     const fileId: [number, number] = [nextRandomInt(0xFFFFFFFF), nextRandomInt(0xFFFFFFFF)];
 
@@ -473,17 +475,24 @@ export class ApiFileManager {
                 return;
               }
   
-              //////this.log('Starting to upload file, isBig:', isBigFile, fileID, part, e.target.result);
+              let buffer = e.target.result as ArrayBuffer;
+              self.debug && self.log('Upload file part, isBig:', isBigFile, part, buffer.byteLength, new Uint8Array(buffer).length, new Uint8Array(buffer).slice().length);
+
+              /* const u = new Uint8Array(buffer.byteLength);
+              for(let i = 0; i < u.length; ++i) {
+                //u[i] = Math.random() * 255 | 0;
+                u[i] = 0;
+              }
+              buffer = u.buffer; */
   
               apiManager.invokeApi(method, {
                 file_id: fileId,
                 file_part: part,
                 file_total_parts: totalParts,
-                bytes: e.target.result/* new Uint8Array(e.target.result as ArrayBuffer) */
+                bytes: buffer/* new Uint8Array(buffer) */
               } as any, {
                 //startMaxLength: partSize + 256,
-                fileUpload: true,
-                //singleInRequest: true
+                fileUpload: true
               }).then((result) => {
                 doneParts++;
                 uploadResolve();
@@ -513,7 +522,7 @@ export class ApiFileManager {
       (r.value as Promise<void>).then(process);
     };
 
-    const maxRequests = 10;
+    const maxRequests = Infinity;
     //const maxRequests = 10;
     /* for(let i = 0; i < 10; ++i) {
       process();
@@ -523,7 +532,7 @@ export class ApiFileManager {
     }
 
     deferred.cancel = () => {
-      this.log('cancel upload', canceled, resolved);
+      //this.log('cancel upload', canceled, resolved);
       if(!canceled && !resolved) {
         canceled = true;
         errorHandler({type: 'UPLOAD_CANCELED'});
diff --git a/src/lib/mtproto/apiManager.ts b/src/lib/mtproto/apiManager.ts
index 939d006c..6c01a854 100644
--- a/src/lib/mtproto/apiManager.ts
+++ b/src/lib/mtproto/apiManager.ts
@@ -182,8 +182,16 @@ export class ApiManager {
     }
     
     const networkers = cache[dcId];
-    if(networkers.length >= /* 1 */(connectionType !== 'download' ? 1 : 3)) {
-      const networker = networkers.pop();
+    if(networkers.length >= /* 1 */(connectionType === 'client' ? 1 : (connectionType === 'download' ? 3 : 3))) {
+      let i = networkers.length - 1, found = false;
+      for(; i >= 0; --i) {
+        if(networkers[i].isOnline) {
+          found = true;
+          break;
+        }
+      }
+      
+      const networker = found ? networkers.splice(i, 1)[0] : networkers.pop();
       networkers.unshift(networker);
       return Promise.resolve(networker);
     }
diff --git a/src/lib/mtproto/authorizer.ts b/src/lib/mtproto/authorizer.ts
index da2f3482..6ff0336a 100644
--- a/src/lib/mtproto/authorizer.ts
+++ b/src/lib/mtproto/authorizer.ts
@@ -70,16 +70,16 @@ export class Authorizer {
   }
   
   public mtpSendPlainRequest(dcId: number, requestArray: Uint8Array) {
-    var requestLength = requestArray.byteLength;
+    const requestLength = requestArray.byteLength;
     //requestArray = new /* Int32Array */Uint8Array(requestBuffer);
     
-    var header = new TLSerialization();
+    const header = new TLSerialization();
     header.storeLongP(0, 0, 'auth_key_id'); // Auth key
     header.storeLong(timeManager.generateId(), 'msg_id'); // Msg_id
     header.storeInt(requestLength, 'request_length');
     
-    let headerArray = header.getBytes(true) as Uint8Array;
-    let resultArray = new Uint8Array(headerArray.byteLength + requestLength);
+    const headerArray = header.getBytes(true) as Uint8Array;
+    const resultArray = new Uint8Array(headerArray.byteLength + requestLength);
     resultArray.set(headerArray);
     resultArray.set(requestArray, headerArray.length);
     
@@ -93,9 +93,9 @@ export class Authorizer {
     resultArray.set(headerArray);
     resultArray.set(requestArray, headerArray.length);
     
-    let requestData = xhrSendBuffer ? resultBuffer : resultArray; */
-    let transport = dcConfigurator.chooseServer(dcId);
-    let baseError = {
+    const requestData = xhrSendBuffer ? resultBuffer : resultArray; */
+    const transport = dcConfigurator.chooseServer(dcId);
+    const baseError = {
       code: 406,
       type: 'NETWORK_BAD_RESPONSE',
       transport: transport
@@ -118,20 +118,20 @@ export class Authorizer {
         /* result = fResult ? fResult : result;
         fResult = new Uint8Array(0); */
         
-        let deserializer = new TLDeserialization(result, {mtproto: true});
-        let auth_key_id = deserializer.fetchLong('auth_key_id');
-        if(auth_key_id !== 0) this.log.error('auth_key_id !== 0', auth_key_id);
+        const deserializer = new TLDeserialization(result, {mtproto: true});
+        const auth_key_id = deserializer.fetchLong('auth_key_id');
+        if(auth_key_id !== '0') this.log.error('auth_key_id !== 0', auth_key_id);
         
-        let msg_id = deserializer.fetchLong('msg_id');
-        if(msg_id === 0) this.log.error('msg_id === 0', msg_id);
+        const msg_id = deserializer.fetchLong('msg_id');
+        if(msg_id === '0') this.log.error('msg_id === 0', msg_id);
         
-        let msg_len = deserializer.fetchInt('msg_len');
+        const msg_len = deserializer.fetchInt('msg_len');
         if(!msg_len) this.log.error('no msg_len', msg_len);
         
         return deserializer;
       } catch(e) {
         this.log.error('mtpSendPlainRequest: deserialization went bad', e);
-        let error = Object.assign(baseError, {originalError: e});
+        const error = Object.assign(baseError, {originalError: e});
         throw error;
       }
     }, error => {
diff --git a/src/lib/mtproto/dcConfigurator.ts b/src/lib/mtproto/dcConfigurator.ts
index 7fac3a5a..d61229e2 100644
--- a/src/lib/mtproto/dcConfigurator.ts
+++ b/src/lib/mtproto/dcConfigurator.ts
@@ -48,7 +48,7 @@ export class DcConfigurator {
     const path = Modes.test ? 'apiws_test' : 'apiws';
     const chosenServer = 'wss://' + subdomain + '.web.telegram.org/' + path;
     const suffix = connectionType === 'upload' ? '-U' : connectionType === 'download' ? '-D' : '';
-    return new Socket(dcId, chosenServer, suffix);
+    return new Socket(dcId, chosenServer, suffix, connectionType === 'client' ? 30000 : 10000);
   };
 
   private transportHTTP = (dcId: number, connectionType: ConnectionType) => {
diff --git a/src/lib/mtproto/networker.ts b/src/lib/mtproto/networker.ts
index ec96e0a3..1c639199 100644
--- a/src/lib/mtproto/networker.ts
+++ b/src/lib/mtproto/networker.ts
@@ -7,12 +7,12 @@ import Schema from './schema';
 import timeManager from './timeManager';
 import NetworkerFactory from './networkerFactory';
 import { logger, LogLevels } from '../logger';
-import { Modes, App } from './mtproto_config';
+import { Modes, App, DEBUG } from './mtproto_config';
 import { InvokeApiOptions } from '../../types';
 import { longToBytes } from '../crypto/crypto_utils';
 import MTTransport from './transports/transport';
 import { convertToUint8Array, bufferConcat, bytesCmp, bytesToHex } from '../../helpers/bytes';
-import { nextRandomInt } from '../../helpers/random';
+import { nextRandomInt, randomLong } from '../../helpers/random';
 
 /// #if MTPROTO_HTTP_UPLOAD
 // @ts-ignore
@@ -62,7 +62,6 @@ export type MTMessage = InvokeApiOptions & MTMessageOptions & {
 
   resultType?: string,
 
-  singleInRequest?: true,
   longPoll?: true,
   noResponse?: true, // only with http (http_wait for longPoll)
 };
@@ -107,21 +106,17 @@ export default class MTPNetworker {
     resend_msg_ids: Array<string>
   } | null = null;
 
-  //private transport: MTTransport;
-
   private name: string;
   private log: ReturnType<typeof logger>;
   
-  private isOnline = false;
+  public isOnline = false;
   private lastResponseTime = 0;
+  private disconnectDelay: number;
   //public onConnectionStatusChange: (online: boolean) => void;
 
   constructor(public dcId: number, private authKey: number[], private authKeyId: Uint8Array,
     private serverSalt: number[], private transport: MTTransport, options: InvokeApiOptions = {}) {
     this.authKeyUint8 = convertToUint8Array(this.authKey);
-    //this.authKeyID = sha1BytesSync(this.authKey).slice(-8);
-
-    //console.trace('Create', dcId, options);
 
     this.isFileUpload = !!options.fileUpload;
     this.isFileDownload = !!options.fileDownload;
@@ -130,7 +125,7 @@ export default class MTPNetworker {
     const suffix = this.isFileUpload ? '-U' : this.isFileDownload ? '-D' : '';
     this.name = 'NET-' + dcId + suffix;
     //this.log = logger(this.name, this.upload && this.dcId === 2 ? LogLevels.debug | LogLevels.warn | LogLevels.log | LogLevels.error : LogLevels.error);
-    this.log = logger(this.name, LogLevels.log | LogLevels.error);
+    this.log = logger(this.name, LogLevels.log | LogLevels.error | LogLevels.debug | LogLevels.warn);
     this.log('constructor'/* , this.authKey, this.authKeyID, this.serverSalt */);
 
     // Test resend after bad_server_salt
@@ -163,6 +158,13 @@ export default class MTPNetworker {
       (this.transport as Socket).networker = this;
     //}
     /// #endif
+
+    // * handle outcoming dead socket, server will close the connection
+    if((this.transport as Socket).networker) {
+      this.disconnectDelay = (this.transport as Socket).retryTimeout / 1000 | 0;
+      setInterval(this.sendPingDelayDisconnect, (this.disconnectDelay - 5) * 1000);
+      this.sendPingDelayDisconnect();
+    }
   }
 
   public updateSession() {
@@ -178,21 +180,20 @@ export default class MTPNetworker {
     }
 
     if(sentMessage.container) {
-      const newInner: string[] = [];
-      sentMessage.inner.forEach((innerSentMessageId) => {
+      sentMessage.inner.forEachReverse((innerSentMessageId, idx) => {
         const innerSentMessage = this.updateSentMessage(innerSentMessageId);
-        if(innerSentMessage) {
-          newInner.push(innerSentMessage.msg_id);
+        if(!innerSentMessage) {
+          sentMessage.inner.splice(idx, 1);
         }
       });
-
-      sentMessage.inner = newInner;
     }
   
     sentMessage.msg_id = timeManager.generateId();
     sentMessage.seq_no = this.generateSeqNo(sentMessage.notContentRelated || sentMessage.container);
 
-    this.log('updateSentMessage', sentMessage.msg_id, sentMessageId);
+    /* if(DEBUG) {
+      this.log('updateSentMessage', sentMessage.msg_id, sentMessageId);
+    } */
 
     this.sentMessages[sentMessage.msg_id] = sentMessage;
     delete this.sentMessages[sentMessageId];
@@ -292,7 +293,10 @@ export default class MTPNetworker {
       const invokeAfterMsg = Schema.API.methods.find(m => m.method === 'invokeAfterMsg');
       if(!invokeAfterMsg) throw new Error('no invokeAfterMsg!');
 
-      this.log('Api call options.afterMessageId!');
+      if(DEBUG) {
+        this.log('Api call options.afterMessageId!');
+      }
+
       serializer.storeInt(+invokeAfterMsg.id >>> 0, 'invokeAfterMsg');
       serializer.storeLong(options.afterMessageId, 'msg_id');
     }
@@ -314,13 +318,24 @@ export default class MTPNetworker {
   
     if(Modes.debug/*  || true */) {
       this.log('Api call', method, message, params, options);
-    } else {
+    } else if(DEBUG) {
       this.log('Api call', method, params, options);
     }
   
     return this.pushMessage(message, options);
   }
 
+  private sendPingDelayDisconnect = () => {
+    if(!this.isOnline) return; // * already disconnected
+    this.wrapMtpCall('ping_delay_disconnect', {
+      ping_id: randomLong(),
+      disconnect_delay: this.disconnectDelay
+    }, {
+      noResponse: true,
+      notContentRelated: true
+    });
+  };
+
   /// #if MTPROTO_HTTP || MTPROTO_HTTP_UPLOAD
   public checkLongPoll = () => {
     const isClean = this.cleanupSent();
@@ -421,15 +436,19 @@ export default class MTPNetworker {
       this.checkConnectionTimeout = setTimeout(this.checkConnection, this.checkConnectionPeriod * 1000 | 0);
       this.checkConnectionPeriod = Math.min(30, (1 + this.checkConnectionPeriod) * 1.5);
   
+      /// #if !MTPROTO_WORKER
       document.body.addEventListener('online', this.checkConnection, false);
       document.body.addEventListener('focus', this.checkConnection, false);
+      /// #endif
     } else {
       this.checkLongPoll();
 
       this.scheduleRequest();
   
+      /// #if !MTPROTO_WORKER
       document.body.removeEventListener('online', this.checkConnection);
       document.body.removeEventListener('focus', this.checkConnection);
+      /// #endif
 
       clearTimeout(this.checkConnectionTimeout);
       this.checkConnectionTimeout = 0;
@@ -539,16 +558,20 @@ export default class MTPNetworker {
     const willChange = this.isOnline !== online;
     this.isOnline = online;
 
-    if(willChange && NetworkerFactory.onConnectionStatusChange) {
-      NetworkerFactory.onConnectionStatusChange({
-        _: 'networkerStatus', 
-        online: this.isOnline, 
-        dcId: this.dcId,
-        name: this.name,
-        isFileNetworker: this.isFileNetworker,
-        isFileDownload: this.isFileDownload,
-        isFileUpload: this.isFileUpload
-      });
+    if(willChange) {
+      if(NetworkerFactory.onConnectionStatusChange) {
+        NetworkerFactory.onConnectionStatusChange({
+          _: 'networkerStatus', 
+          online: this.isOnline, 
+          dcId: this.dcId,
+          name: this.name,
+          isFileNetworker: this.isFileNetworker,
+          isFileDownload: this.isFileDownload,
+          isFileUpload: this.isFileUpload
+        });
+      }
+
+      this.sendPingDelayDisconnect();
     }
     /* if(this.onConnectionStatusChange) {
       this.onConnectionStatusChange(this.isOnline);
@@ -565,8 +588,14 @@ export default class MTPNetworker {
     } else {
       this.pendingMessages[messageId] = value;
     }
+
+    if(sentMessage.acked) {
+      this.log.error('pushResend: acked message?', sentMessage);
+    }
   
-    this.log('Resend', messageId, sentMessage, this.pendingMessages);
+    if(DEBUG) {
+      this.log('pushResend:', messageId, sentMessage, this.pendingMessages);
+    }
   
     this.scheduleRequest(delay);
   }
@@ -614,18 +643,9 @@ export default class MTPNetworker {
     });
   }
 
-  public performScheduledRequest = () => {
+  private performScheduledRequest() {
     // this.log('scheduled', this.dcId, this.iii)
 
-    /// #if MTPROTO_HTTP || MTPROTO_HTTP_UPLOAD
-    if(this.offline) {
-      this.log('Cancel scheduled');
-      return false;
-    }
-
-    this.nextReq = 0;
-    /// #endif
-
     if(this.pendingAcks.length) {
       const ackMsgIds: Array<string> = this.pendingAcks.slice();
 
@@ -647,7 +667,7 @@ export default class MTPNetworker {
         messageId: '' // will set in wrapMtpMessage->pushMessage
       };
 
-      this.log('resendReq messages', resendMsgIds);
+      //this.log('resendReq messages', resendMsgIds);
       this.wrapMtpMessage({
         _: 'msg_resend_req',
         msg_ids: resendMsgIds
@@ -667,17 +687,18 @@ export default class MTPNetworker {
     let hasApiCall = false;
     let hasHttpWait = false;
     let lengthOverflow = false;
-    let singlesCount = 0;
 
     for(const messageId in this.pendingMessages) {
       const value = this.pendingMessages[messageId];
 
       if(!value || value >= currentTime) {
         if(message = this.sentMessages[messageId]) {
-          //this.log('performScheduledRequest message:', message);
-          const messageByteLength = (/* message.body.byteLength ||  */message.body.length) + 32;
-          if(!message.notContentRelated &&
-            lengthOverflow) {
+          /* if(message.fileUpload) {
+            this.log('performScheduledRequest message:', message, message.body.length, (message.body as Uint8Array).byteLength, (message.body as Uint8Array).buffer.byteLength);
+          } */
+
+          const messageByteLength = message.body.length + 32;
+          if(!message.notContentRelated && lengthOverflow) {
             continue; // maybe break here
           }
 
@@ -689,13 +710,6 @@ export default class MTPNetworker {
             continue; // maybe break here
           }
 
-          if(message.singleInRequest) {
-            singlesCount++;
-            if(singlesCount > 1) {
-              continue; // maybe break here
-            }
-          }
-
           messages.push(message);
           messagesByteLen += messageByteLength;
           if(message.isAPI) {
@@ -772,7 +786,7 @@ export default class MTPNetworker {
   
       this.sentMessages[message.msg_id] = containerSentMessage;
   
-      if(Modes.debug || true) {
+      if(Modes.debug) {
         this.log('Container', innerMessages, message.msg_id, message.seq_no);
       }
     } else {
@@ -789,14 +803,14 @@ export default class MTPNetworker {
     
     /// #if MTPROTO_HTTP_UPLOAD
     if(!(this.transport instanceof HTTP)) {
-      if(noResponseMsgs.length) this.log.error('noResponseMsgs length!', noResponseMsgs);
+      //if(noResponseMsgs.length) this.log.error('noResponseMsgs length!', noResponseMsgs);
       this.cleanupSent(); // ! WARNING
     } else {
       this.handleSentEncryptedRequestHTTP(promise, message, noResponseMsgs);
     }
     /// #elif !MTPROTO_HTTP
     //if(!(this.transport instanceof HTTP)) {
-      if(noResponseMsgs.length) this.log.error('noResponseMsgs length!', noResponseMsgs);
+      //if(noResponseMsgs.length) this.log.error('noResponseMsgs length!', noResponseMsgs);
       this.cleanupSent(); // ! WARNING
     //} else {
     /// #else
@@ -804,7 +818,7 @@ export default class MTPNetworker {
     //}
     /// #endif 
   
-    if(lengthOverflow || singlesCount > 1) {
+    if(lengthOverflow) {
       this.scheduleRequest();
     }
   };
@@ -832,8 +846,10 @@ export default class MTPNetworker {
   }
 
   public sendEncryptedRequest(message: MTMessage) {
-    this.log.debug('Send encrypted', message, this.authKeyId);
-    // console.trace()
+    /* if(DEBUG) {
+      this.log.debug('Send encrypted', message, this.authKeyId);
+    } */
+
     const data = new TLSerialization({
       startMaxLength: message.body.length + 2048
     });
@@ -851,7 +867,6 @@ export default class MTPNetworker {
   
     const paddingLength = (16 - (data.offset % 16)) + 16 * (1 + nextRandomInt(5));
     const padding = [...new Uint8Array(paddingLength).randomize()];
-    //MTProto.secureRandom.nextBytes(padding);
 
     const dataWithPadding = bufferConcat(dataBuffer, padding);
     // this.log('Adding padding', dataBuffer, padding, dataWithPadding)
@@ -862,7 +877,9 @@ export default class MTPNetworker {
     } */
   
     return this.getEncryptedMessage(dataWithPadding).then((encryptedResult) => {
-      this.log.debug('Got encrypted out message', encryptedResult);
+      /* if(DEBUG) {
+        this.log.debug('Got encrypted out message', encryptedResult);
+      } */
 
       const request = new TLSerialization({
         startMaxLength: encryptedResult.bytes.length + 256
@@ -871,25 +888,23 @@ export default class MTPNetworker {
       request.storeIntBytes(encryptedResult.msgKey, 128, 'msg_key');
       request.storeRawBytes(encryptedResult.bytes, 'encrypted_data');
   
-      //var requestData = xhrSendBuffer ? request.getBuffer() : request.getBytes(true) as Uint8Array;
       const requestData = request.getBytes(true);
 
-      const baseError = {
-        code: 406,
-        type: 'NETWORK_BAD_RESPONSE',
-        transport: this.transport
-      };
-
       /* if(message.fileUpload) {
         this.log('Send encrypted: requestData length:', requestData.length, requestData.length % 16, paddingLength % 16, paddingLength, data.offset);
       } */
 
       const promise = this.transport.send(requestData);
       /// #if !MTPROTO_HTTP && !MTPROTO_HTTP_UPLOAD
-      /* if(!(this.transport instanceof HTTP)) */ return promise;
+      return promise;
       /// #else
       if(!(this.transport instanceof HTTP)) return promise;
 
+      const baseError = {
+        code: 406,
+        type: 'NETWORK_BAD_RESPONSE',
+        transport: this.transport
+      };
       return promise.then((result) => {
         if(!result || !result.byteLength) {
           return Promise.reject(baseError);
@@ -911,7 +926,9 @@ export default class MTPNetworker {
 
   public parseResponse(responseBuffer: Uint8Array) {
     //const perf = performance.now();
-    this.log.debug('Start parsing response'/* , responseBuffer */);
+    /* if(DEBUG) {
+      this.log.debug('Start parsing response', responseBuffer);
+    } */
 
     this.lastResponseTime = Date.now();
 
@@ -1037,6 +1054,7 @@ export default class MTPNetworker {
     this.serverSalt = serverSalt;
   }
 
+  // ! таймаут очень сильно тормозит скорость работы сокета (даже нулевой) 
   public scheduleRequest(delay = 0) {
     /// #if !MTPROTO_HTTP && !MTPROTO_HTTP_UPLOAD
     /* clearTimeout(this.nextReqTimeout);
@@ -1053,22 +1071,37 @@ export default class MTPNetworker {
       delay = 0;
     } */
 
-    var nextReq = Date.now() + delay;
+    const nextReq = Date.now() + delay;
   
     if(delay && this.nextReq && this.nextReq <= nextReq) {
+      //this.log('scheduleRequest: nextReq', this.nextReq, nextReq);
       return false;
     }
   
-    // this.log('schedule req', delay)
-    // console.trace()
-  
+    //this.log('scheduleRequest: delay', delay);
+
+    /* if(this.nextReqTimeout) {
+      return;
+    } */
+    
+    const perf = performance.now();
     clearTimeout(this.nextReqTimeout);
-    this.nextReqTimeout = 0;
-    if(delay > 0) {
-      this.nextReqTimeout = self.setTimeout(this.performScheduledRequest, delay || 0);
-    } else {
-      setTimeout(this.performScheduledRequest, 0);
-    }
+    this.nextReqTimeout = self.setTimeout(() => {
+      //this.log('scheduleRequest: timeout delay was:', performance.now() - perf);
+
+      this.nextReqTimeout = 0;
+
+      /// #if MTPROTO_HTTP || MTPROTO_HTTP_UPLOAD || true
+      if(this.offline) {
+        //this.log('Cancel scheduled');
+        return false;
+      }
+
+      this.nextReq = 0;
+      /// #endif
+
+      this.performScheduledRequest();
+    }, delay);
   
     this.nextReq = nextReq;
     /// #endif
@@ -1081,7 +1114,10 @@ export default class MTPNetworker {
   }
   
   public reqResendMessage(msgId: string) {
-    this.log('Req resend', msgId);
+    if(DEBUG) {
+      this.log('Req resend', msgId);
+    }
+
     this.pendingResends.push(msgId);
     this.scheduleRequest(100);
   }
@@ -1119,11 +1155,7 @@ export default class MTPNetworker {
     if(sentMessage && !sentMessage.acked) {
       delete sentMessage.body;
       sentMessage.acked = true;
-  
-      return true;
     }
-  
-    return false;
   }
 
   public processError(rawError: {error_message: string, error_code: number}) {
@@ -1182,7 +1214,9 @@ export default class MTPNetworker {
       return;
     }
 
-    this.log.debug('process message', message, messageId, sessionId);
+    /* if(DEBUG) {
+      this.log('process message', message, messageId, sessionId);
+    } */
 
     switch(message._) {
       case 'msg_container': {
@@ -1254,7 +1288,9 @@ export default class MTPNetworker {
       case 'new_session_created': {
         this.ackMessage(messageId);
 
-        this.log.debug('new_session_created', message);
+        if(DEBUG) {
+          this.log.debug('new_session_created', message);
+        }
         //this.updateSession();
   
         this.processMessageAck(message.first_msg_id);
@@ -1322,20 +1358,9 @@ export default class MTPNetworker {
             }
           } else {
             if(deferred) {
-              if(Modes.debug) {
-                this.log.debug('Rpc response', message.result);
-              } else {
-                let dRes = message.result._;
-                if(!dRes) {
-                  if(message.result.length > 5) {
-                    dRes = '[..' + message.result.length + '..]';
-                  } else {
-                    dRes = message.result;
-                  }
-                }
-
-                this.log.debug('Rpc response', dRes, sentMessage);
-              }
+              /* if(DEBUG) {
+                this.log.debug('Rpc response', message.result, sentMessage);
+              } */
 
               sentMessage.deferred.resolve(message.result);
             }
@@ -1348,16 +1373,35 @@ export default class MTPNetworker {
   
           delete this.sentMessages[sentMessageId];
         } else {
-          this.log('Rpc result for unknown message:', sentMessageId);
+          if(DEBUG) {
+            this.log('Rpc result for unknown message:', sentMessageId, message);
+          }
         }
 
         break;
       }
+
+      case 'pong': { // * https://core.telegram.org/mtproto/service_messages#ping-messages-pingpong - These messages do not require acknowledgments
+        /* if((this.transport as Socket).networker) {
+          const sentMessageId = message.msg_id;
+          const sentMessage = this.sentMessages[sentMessageId];
+
+          if(sentMessage) {
+            delete this.sentMessages[sentMessageId];
+          }
+
+          
+        } */
+
+        break;
+      }
   
       default:
         this.ackMessage(messageId);
 
-        this.log.debug('Update', message);
+        /* if(DEBUG) {
+          this.log.debug('Update', message);
+        } */
         
         if(NetworkerFactory.updatesProcessor !== null) {
           NetworkerFactory.updatesProcessor(message);
diff --git a/src/lib/mtproto/tl_utils.ts b/src/lib/mtproto/tl_utils.ts
index 76494472..e85f5194 100644
--- a/src/lib/mtproto/tl_utils.ts
+++ b/src/lib/mtproto/tl_utils.ts
@@ -37,8 +37,8 @@ class TLSerialization {
   }
 
   public getArray() {
-    let resultBuffer = new ArrayBuffer(this.offset);
-    let resultArray = new Int32Array(resultBuffer);
+    const resultBuffer = new ArrayBuffer(this.offset);
+    const resultArray = new Int32Array(resultBuffer);
   
     resultArray.set(this.intView.subarray(0, this.offset / 4));
   
@@ -53,16 +53,16 @@ class TLSerialization {
   public getBytes(typed?: false): number[];
   public getBytes(typed?: boolean): number[] | Uint8Array {
     if(typed) {
-      let resultBuffer = new ArrayBuffer(this.offset);
-      let resultArray = new Uint8Array(resultBuffer);
+      const resultBuffer = new ArrayBuffer(this.offset);
+      const resultArray = new Uint8Array(resultBuffer);
   
       resultArray.set(this.byteView.subarray(0, this.offset));
   
       return resultArray;
     }
   
-    let bytes: number[] = [];
-    for(var i = 0; i < this.offset; i++) {
+    const bytes: number[] = [];
+    for(let i = 0; i < this.offset; i++) {
       bytes.push(this.byteView[i]);
     }
     return bytes;
@@ -126,16 +126,16 @@ class TLSerialization {
     if(typeof sLong !== 'string') {
       sLong = sLong ? sLong.toString() : '0';
     }
-    var divRem = bigStringInt(sLong).divideAndRemainder(bigint(0x100000000));
+    const divRem = bigStringInt(sLong).divideAndRemainder(bigint(0x100000000));
   
     this.writeInt(divRem[1].intValue(), (field || '') + ':long[low]');
     this.writeInt(divRem[0].intValue(), (field || '') + ':long[high]');
   }
   
   public storeDouble(f: any, field?: string) {
-    var buffer = new ArrayBuffer(8);
-    var intView = new Int32Array(buffer);
-    var doubleView = new Float64Array(buffer);
+    const buffer = new ArrayBuffer(8);
+    const intView = new Int32Array(buffer);
+    const doubleView = new Float64Array(buffer);
   
     doubleView[0] = f;
   
@@ -149,11 +149,11 @@ class TLSerialization {
     if(s === undefined) {
       s = '';
     }
-    var sUTF8 = unescape(encodeURIComponent(s));
+    const sUTF8 = unescape(encodeURIComponent(s));
   
     this.checkLength(sUTF8.length + 8);
   
-    var len = sUTF8.length;
+    const len = sUTF8.length;
     if(len <= 253) {
       this.byteView[this.offset++] = len;
     } else {
@@ -162,7 +162,7 @@ class TLSerialization {
       this.byteView[this.offset++] = (len & 0xFF00) >> 8;
       this.byteView[this.offset++] = (len & 0xFF0000) >> 16;
     }
-    for(var i = 0; i < len; i++) {
+    for(let i = 0; i < len; i++) {
       this.byteView[this.offset++] = sUTF8.charCodeAt(i);
     }
   
@@ -181,7 +181,7 @@ class TLSerialization {
     this.debug && console.log('>>>', bytesToHex(bytes as number[]), (field || '') + ':bytes');
   
     // if uint8array were json.stringified, then will be: {'0': 123, '1': 123}
-    var len = (bytes as ArrayBuffer).byteLength || (bytes as Uint8Array).length;
+    const len = (bytes as ArrayBuffer).byteLength || (bytes as Uint8Array).length;
     this.checkLength(len + 8);
     if(len <= 253) {
       this.byteView[this.offset++] = len;
@@ -206,7 +206,7 @@ class TLSerialization {
       bytes = new Uint8Array(bytes);
     }
 
-    var len = bytes.length;
+    const len = bytes.length;
     if((bits % 32) || (len * 8) !== bits) {
       const error = new Error('Invalid bits: ' + bits + ', ' + bytes.length);
       console.error(error, bytes, field);
@@ -225,7 +225,7 @@ class TLSerialization {
       bytes = new Uint8Array(bytes);
     }
 
-    var len = bytes.length;
+    const len = bytes.length;
   
     this.debug && console.log('>>>', bytesToHex(bytes), (field || ''));
     this.checkLength(len);
@@ -317,9 +317,9 @@ class TLSerialization {
         throw new Error('Invalid vector type ' + type);
       }
 
-      var itemType = type.substr(7, type.length - 8); // for "Vector<itemType>"
+      const itemType = type.substr(7, type.length - 8); // for "Vector<itemType>"
       this.writeInt(obj.length, field + '[count]');
-      for(var i = 0; i < obj.length; i++) {
+      for(let i = 0; i < obj.length; i++) {
         this.storeObject(obj[i], itemType, field + '[' + i + ']');
       }
 
@@ -437,7 +437,7 @@ class TLDeserialization {
     }
   
     //var i = this.intView[this.offset / 4];
-    let i = new Uint32Array(this.byteView.buffer.slice(this.offset, this.offset + 4))[0];
+    const i = new Uint32Array(this.byteView.buffer.slice(this.offset, this.offset + 4))[0];
   
     this.debug/*  || field.includes('[dialog][read_outbox_max_id]') */ 
       && console.log('<<<', i.toString(16), i, field, 
@@ -454,9 +454,9 @@ class TLDeserialization {
   }
   
   public fetchDouble(field?: string) {
-    var buffer = new ArrayBuffer(8);
-    var intView = new Int32Array(buffer);
-    var doubleView = new Float64Array(buffer);
+    const buffer = new ArrayBuffer(8);
+    const intView = new Int32Array(buffer);
+    const doubleView = new Float64Array(buffer);
   
     intView[0] = this.readInt((field || '') + ':double[low]'),
     intView[1] = this.readInt((field || '') + ':double[high]');
@@ -464,17 +464,17 @@ class TLDeserialization {
     return doubleView[0];
   }
   
-  public fetchLong(field?: string) {
-    var iLow = this.readInt((field || '') + ':long[low]');
-    var iHigh = this.readInt((field || '') + ':long[high]');
+  public fetchLong(field?: string): string {
+    const iLow = this.readInt((field || '') + ':long[low]');
+    const iHigh = this.readInt((field || '') + ':long[high]');
   
-    var longDec = bigint(iHigh).shiftLeft(32).add(bigint(iLow)).toString();
+    const longDec = bigint(iHigh).shiftLeft(32).add(bigint(iLow)).toString();
   
     return longDec;
   }
   
-  public fetchBool(field?: string) {
-    var i = this.readInt((field || '') + ':bool');
+  public fetchBool(field?: string): boolean {
+    const i = this.readInt((field || '') + ':bool');
     if(i === boolTrue) {
       return true;
     } else if(i === boolFalse) {
@@ -485,17 +485,17 @@ class TLDeserialization {
     return this.fetchObject('Object', field);
   }
   
-  public fetchString(field?: string) {
-    var len = this.byteView[this.offset++];
+  public fetchString(field?: string): string {
+    let len = this.byteView[this.offset++];
   
     if(len === 254) {
-      var len = this.byteView[this.offset++] |
+      len = this.byteView[this.offset++] |
         (this.byteView[this.offset++] << 8) |
         (this.byteView[this.offset++] << 16);
     }
   
-    var sUTF8 = '';
-    for(var i = 0; i < len; i++) {
+    let sUTF8 = '';
+    for(let i = 0; i < len; i++) {
       sUTF8 += String.fromCharCode(this.byteView[this.offset++]);
     }
   
@@ -504,10 +504,11 @@ class TLDeserialization {
       this.offset++;
     }
   
+    let s: string;
     try {
-      var s = decodeURIComponent(escape(sUTF8));
+      s = decodeURIComponent(escape(sUTF8));
     } catch (e) {
-      var s = sUTF8;
+      s = sUTF8;
     }
   
     this.debug && console.log('<<<', s, (field || '') + ':string');
@@ -515,8 +516,8 @@ class TLDeserialization {
     return s;
   }
   
-  public fetchBytes(field?: string) {
-    var len = this.byteView[this.offset++];
+  public fetchBytes(field?: string): Uint8Array {
+    let len = this.byteView[this.offset++];
   
     if(len === 254) {
       len = this.byteView[this.offset++] |
@@ -524,7 +525,7 @@ class TLDeserialization {
         (this.byteView[this.offset++] << 16);
     }
   
-    var bytes = this.byteView.subarray(this.offset, this.offset + len);
+    const bytes = this.byteView.subarray(this.offset, this.offset + len);
     this.offset += len;
   
     // Padding
@@ -544,15 +545,15 @@ class TLDeserialization {
       throw new Error('Invalid bits: ' + bits);
     }
   
-    var len = bits / 8;
+    const len = bits / 8;
     if(typed) {
-      var result = this.byteView.subarray(this.offset, this.offset + len);
+      const result = this.byteView.subarray(this.offset, this.offset + len);
       this.offset += len;
       return result;
     }
   
-    var bytes = [];
-    for(var i = 0; i < len; i++) {
+    const bytes: number[] = [];
+    for(let i = 0; i < len; i++) {
       bytes.push(this.byteView[this.offset++]);
     }
   
@@ -572,14 +573,14 @@ class TLDeserialization {
     }
   
     if(typed) {
-      let bytes = new Uint8Array(len);
+      const bytes = new Uint8Array(len);
       bytes.set(this.byteView.subarray(this.offset, this.offset + len));
       this.offset += len;
       return bytes;
     }
   
-    var bytes = [];
-    for(var i = 0; i < len; i++) {
+    const bytes: number[] = [];
+    for(let i = 0; i < len; i++) {
       bytes.push(this.byteView[this.offset++]);
     }
   
diff --git a/src/lib/mtproto/transports/websocket.ts b/src/lib/mtproto/transports/websocket.ts
index 76e5f938..3b17526b 100644
--- a/src/lib/mtproto/transports/websocket.ts
+++ b/src/lib/mtproto/transports/websocket.ts
@@ -5,8 +5,8 @@ import intermediatePacketCodec from './intermediate';
 import MTPNetworker from '../networker';
 import { logger, LogLevels } from '../../logger';
 import Obfuscation from './obfuscation';
-
-const CONNECTION_RETRY_TIMEOUT = 30000;
+import { DEBUG, Modes } from '../mtproto_config';
+//import { debounce } from '../../../helpers/schedulers';
 
 export default class Socket extends MTTransport {
   ws: WebSocket;
@@ -32,12 +32,18 @@ export default class Socket extends MTTransport {
 
   lastCloseTime: number;
 
-  constructor(dcId: number, url: string, logSuffix: string) {
+  debug = Modes.debug;
+  //releasePendingDebounced: () => void;
+
+  constructor(dcId: number, url: string, logSuffix: string, public retryTimeout: number) {
     super(dcId, url);
 
-    this.log = logger(`WS-${dcId}` + logSuffix, LogLevels.error | LogLevels.log/*  | LogLevels.debug */);
+    let logLevel = LogLevels.error | LogLevels.log;
+    if(this.debug) logLevel |= LogLevels.debug;
+    this.log = logger(`WS-${dcId}` + logSuffix, logLevel);
     this.log('constructor');
     this.connect();
+    //this.releasePendingDebounced = debounce(() => this.releasePending(true), 2000, false, true);
   }
   
   connect = () => {
@@ -60,7 +66,7 @@ export default class Socket extends MTTransport {
   handleOpen = () => {
     this.log('opened');
 
-    this.log.debug('sending init packet');
+    this.debug && this.log.debug('sending init packet');
     this.ws.send(this.obfuscation.init(this.codec));
 
     //setTimeout(() => {
@@ -89,7 +95,7 @@ export default class Socket extends MTTransport {
 
     const time = Date.now();
     const diff = time - this.lastCloseTime;
-    const needTimeout = !isNaN(diff) && diff < CONNECTION_RETRY_TIMEOUT ? CONNECTION_RETRY_TIMEOUT - diff : 0;
+    const needTimeout = !isNaN(diff) && diff < this.retryTimeout ? this.retryTimeout - diff : 0;
 
     if(this.networker) {
       this.networker.setConnectionStatus(false);
@@ -111,7 +117,7 @@ export default class Socket extends MTTransport {
   };
 
   handleMessage = (event: MessageEvent) => {
-    this.log.debug('<-', 'handleMessage', event);
+    this.debug && this.log.debug('<-', 'handleMessage', event);
 
     let data = this.obfuscation.decode(new Uint8Array(event.data));
     data = this.codec.readPacket(data);
@@ -119,9 +125,9 @@ export default class Socket extends MTTransport {
     if(this.networker) { // authenticated!
       //this.pending = this.pending.filter(p => p.body); // clear pending
 
-      this.log.debug('redirecting to networker');
+      this.debug && this.log.debug('redirecting to networker');
       return this.networker.parseResponse(data).then(response => {
-        this.log.debug('redirecting to networker response:', response);
+        this.debug && this.log.debug('redirecting to networker response:', response);
         this.networker.processMessage(response.response, response.messageId, response.sessionId);
       });
     }
@@ -129,14 +135,15 @@ export default class Socket extends MTTransport {
     //console.log('got hex:', data.hex);
     const pending = this.pending.shift();
     if(!pending) {
-      return this.log.debug('no pending for res:', data.hex);
+      this.debug && this.log.debug('no pending for res:', data.hex);
+      return;
     }
 
     pending.resolve(data);
   };
 
   send = (body: Uint8Array) => {
-    this.log.debug('-> body length to pending:', body.length);
+    this.debug && this.log.debug('-> body length to pending:', body.length);
 
     //return;
 
@@ -154,12 +161,17 @@ export default class Socket extends MTTransport {
     }
   }
 
-  releasePending() {
+  releasePending(/* tt = false */) {
     if(!this.connected) {
       //this.connect();
       return;
     }
 
+    /* if(!tt) {
+      this.releasePendingDebounced();
+      return;
+    } */
+
     //this.log.error('Pending length:', this.pending.length);
     let length = this.pending.length;
     //for(let i = length - 1; i >= 0; --i) {
@@ -173,7 +185,7 @@ export default class Socket extends MTTransport {
         const enc = this.obfuscation.encode(toEncode);
         //this.log('send after obf:', enc.hex);
 
-        this.log.debug('-> body length to send:', enc.length);
+        this.debug && this.log.debug('-> body length to send:', enc.length, this.ws.bufferedAmount);
         /* if(this.ws.bufferedAmount) {
           this.log.error('bufferedAmount:', this.ws.bufferedAmount);
         } */
diff --git a/webpack.common.js b/webpack.common.js
index feb58d57..aeb94aef 100644
--- a/webpack.common.js
+++ b/webpack.common.js
@@ -6,9 +6,9 @@ const postcssPresetEnv = require('postcss-preset-env');
 const ServiceWorkerWebpackPlugin = require('serviceworker-webpack-plugin');
 const fs = require('fs');
 
-const allowedIPs = ['194.58.97.147', '195.66.140.39', '127.0.0.1', '176.100.8.202'];
+const allowedIPs = ['194.58.97.147', '195.66.140.39', '127.0.0.1', '176.100.8.254'];
 const devMode = process.env.NODE_ENV !== 'production';
-const useLocal = true;
+const useLocal = false;
 const useLocalNotLocal = false;
 
 if(devMode) {
@@ -18,7 +18,7 @@ if(devMode) {
 const opts = {
   MTPROTO_WORKER: true,
   MTPROTO_HTTP: false,
-  MTPROTO_HTTP_UPLOAD: true,
+  MTPROTO_HTTP_UPLOAD: false,
   DEBUG: devMode,
   version: 3,
   "ifdef-verbose": devMode,    // add this for verbose output