diff --git a/libi2pd/Destination.cpp b/libi2pd/Destination.cpp
index 3d5893c7..eeaa6fa2 100644
--- a/libi2pd/Destination.cpp
+++ b/libi2pd/Destination.cpp
@@ -801,7 +801,7 @@ namespace client
 
 	void LeaseSetDestination::RequestLeaseSet (const i2p::data::IdentHash& dest, RequestComplete requestComplete, std::shared_ptr<const i2p::data::BlindedPublicKey> requestedBlindedKey)
 	{
-		std::set<i2p::data::IdentHash> excluded;
+		std::unordered_set<i2p::data::IdentHash> excluded;
 		auto floodfill = i2p::data::netdb.GetClosestFloodfill (dest, excluded);
 		if (floodfill)
 		{
diff --git a/libi2pd/Destination.h b/libi2pd/Destination.h
index a066c64c..9600594d 100644
--- a/libi2pd/Destination.h
+++ b/libi2pd/Destination.h
@@ -15,7 +15,7 @@
 #include <memory>
 #include <map>
 #include <unordered_map>
-#include <set>
+#include <unordered_set>
 #include <string>
 #include <functional>
 #include <boost/asio.hpp>
@@ -97,7 +97,7 @@ namespace client
 		struct LeaseSetRequest
 		{
 			LeaseSetRequest (boost::asio::io_service& service): requestTime (0), requestTimeoutTimer (service) {};
-			std::set<i2p::data::IdentHash> excluded;
+			std::unordered_set<i2p::data::IdentHash> excluded;
 			uint64_t requestTime;
 			boost::asio::deadline_timer requestTimeoutTimer;
 			std::list<RequestComplete> requestComplete;
@@ -195,7 +195,7 @@ namespace client
 			bool m_IsPublic;
 			uint32_t m_PublishReplyToken;
 			uint64_t m_LastSubmissionTime; // in seconds
-			std::set<i2p::data::IdentHash> m_ExcludedFloodfills; // for publishing
+			std::unordered_set<i2p::data::IdentHash> m_ExcludedFloodfills; // for publishing
 
 			boost::asio::deadline_timer m_PublishConfirmationTimer, m_PublishVerificationTimer,
 				m_PublishDelayTimer, m_CleanupTimer;
diff --git a/libi2pd/I2NPProtocol.cpp b/libi2pd/I2NPProtocol.cpp
index bea3f93f..e968daf9 100644
--- a/libi2pd/I2NPProtocol.cpp
+++ b/libi2pd/I2NPProtocol.cpp
@@ -147,7 +147,7 @@ namespace i2p
 	}
 
 	std::shared_ptr<I2NPMessage> CreateRouterInfoDatabaseLookupMsg (const uint8_t * key, const uint8_t * from,
-		uint32_t replyTunnelID, bool exploratory, std::set<i2p::data::IdentHash> * excludedPeers)
+		uint32_t replyTunnelID, bool exploratory, std::unordered_set<i2p::data::IdentHash> * excludedPeers)
 	{
 		int cnt = excludedPeers ? excludedPeers->size () : 0;
 		auto m = cnt > 7 ? NewI2NPMessage () : NewI2NPShortMessage ();
@@ -192,7 +192,7 @@ namespace i2p
 	}
 
 	std::shared_ptr<I2NPMessage> CreateLeaseSetDatabaseLookupMsg (const i2p::data::IdentHash& dest,
-		const std::set<i2p::data::IdentHash>& excludedFloodfills,
+		const std::unordered_set<i2p::data::IdentHash>& excludedFloodfills,
 		std::shared_ptr<const i2p::tunnel::InboundTunnel> replyTunnel, const uint8_t * replyKey,
 			const uint8_t * replyTag, bool replyECIES)
 	{
diff --git a/libi2pd/I2NPProtocol.h b/libi2pd/I2NPProtocol.h
index f110100e..1acd4242 100644
--- a/libi2pd/I2NPProtocol.h
+++ b/libi2pd/I2NPProtocol.h
@@ -11,7 +11,7 @@
 
 #include <inttypes.h>
 #include <string.h>
-#include <set>
+#include <unordered_set>
 #include <memory>
 #include <functional>
 #include "Crypto.h"
@@ -294,9 +294,9 @@ namespace tunnel
 	std::shared_ptr<I2NPMessage> CreateTunnelTestMsg (uint32_t msgID);
 	std::shared_ptr<I2NPMessage> CreateDeliveryStatusMsg (uint32_t msgID);
 	std::shared_ptr<I2NPMessage> CreateRouterInfoDatabaseLookupMsg (const uint8_t * key, const uint8_t * from,
-		uint32_t replyTunnelID, bool exploratory = false, std::set<i2p::data::IdentHash> * excludedPeers = nullptr);
+		uint32_t replyTunnelID, bool exploratory = false, std::unordered_set<i2p::data::IdentHash> * excludedPeers = nullptr);
 	std::shared_ptr<I2NPMessage> CreateLeaseSetDatabaseLookupMsg (const i2p::data::IdentHash& dest,
-		const std::set<i2p::data::IdentHash>& excludedFloodfills,
+		const std::unordered_set<i2p::data::IdentHash>& excludedFloodfills,
 		std::shared_ptr<const i2p::tunnel::InboundTunnel> replyTunnel,
 		const uint8_t * replyKey, const uint8_t * replyTag, bool replyECIES = false);
 	std::shared_ptr<I2NPMessage> CreateDatabaseSearchReply (const i2p::data::IdentHash& ident, std::vector<i2p::data::IdentHash> routers);
diff --git a/libi2pd/NetDb.cpp b/libi2pd/NetDb.cpp
index 3b74ff6e..ea687ffa 100644
--- a/libi2pd/NetDb.cpp
+++ b/libi2pd/NetDb.cpp
@@ -1004,7 +1004,7 @@ namespace data
 		auto dest = m_Requests->FindRequest (ident);
 		if (dest && dest->IsActive ())
 		{
-			if (!dest->IsExploratory () && (num > 0 || dest->GetNumExcludedPeers () < 3)) // before 3-rd attempt might be just bad luck
+			if (!dest->IsExploratory () && (num > 0 || dest->GetNumAttempts () < 3)) // before 3-rd attempt might be just bad luck
 			{	
 				// try to send next requests
 				if (!m_Requests->SendNextRequest (dest))
@@ -1094,7 +1094,7 @@ namespace data
 				return;
 			}	
 			LogPrint (eLogInfo, "NetDb: Exploratory close to ", key, " ", numExcluded, " excluded");
-			std::set<IdentHash> excludedRouters;
+			std::unordered_set<IdentHash> excludedRouters;
 			const uint8_t * excluded_ident = excluded;
 			for (int i = 0; i < numExcluded; i++)
 			{
@@ -1146,7 +1146,7 @@ namespace data
 
 			if (!replyMsg)
 			{
-				std::set<IdentHash> excludedRouters;
+				std::unordered_set<IdentHash> excludedRouters;
 				const uint8_t * exclude_ident = excluded;
 				for (int i = 0; i < numExcluded; i++)
 				{
@@ -1265,7 +1265,7 @@ namespace data
 
 	void NetDb::Flood (const IdentHash& ident, std::shared_ptr<I2NPMessage> floodMsg)
 	{
-		std::set<IdentHash> excluded;
+		std::unordered_set<IdentHash> excluded;
 		excluded.insert (i2p::context.GetIdentHash ()); // don't flood to itself
 		excluded.insert (ident); // don't flood back
 		for (int i = 0; i < 3; i++)
@@ -1306,7 +1306,7 @@ namespace data
 			});
 	}
 
-	std::shared_ptr<const RouterInfo> NetDb::GetRandomSSU2PeerTestRouter (bool v4, const std::set<IdentHash>& excluded) const
+	std::shared_ptr<const RouterInfo> NetDb::GetRandomSSU2PeerTestRouter (bool v4, const std::unordered_set<IdentHash>& excluded) const
 	{
 		return GetRandomRouter (
 			[v4, &excluded](std::shared_ptr<const RouterInfo> router)->bool
@@ -1316,7 +1316,7 @@ namespace data
 			});
 	}
 
-	std::shared_ptr<const RouterInfo> NetDb::GetRandomSSU2Introducer (bool v4, const std::set<IdentHash>& excluded) const
+	std::shared_ptr<const RouterInfo> NetDb::GetRandomSSU2Introducer (bool v4, const std::unordered_set<IdentHash>& excluded) const
 	{
 		return GetRandomRouter (
 			[v4, &excluded](std::shared_ptr<const RouterInfo> router)->bool
@@ -1412,7 +1412,7 @@ namespace data
 	}
 
 	std::shared_ptr<const RouterInfo> NetDb::GetClosestFloodfill (const IdentHash& destination,
-		const std::set<IdentHash>& excluded) const
+		const std::unordered_set<IdentHash>& excluded) const
 	{
 		IdentHash destKey = CreateRoutingKey (destination);
 		std::lock_guard<std::mutex> l(m_FloodfillsMutex);
@@ -1424,7 +1424,7 @@ namespace data
 	}
 
 	std::vector<IdentHash> NetDb::GetClosestFloodfills (const IdentHash& destination, size_t num,
-		std::set<IdentHash>& excluded, bool closeThanUsOnly) const
+		std::unordered_set<IdentHash>& excluded, bool closeThanUsOnly) const
 	{
 		std::vector<IdentHash> res;
 		IdentHash destKey = CreateRoutingKey (destination);
@@ -1459,7 +1459,7 @@ namespace data
 	}
 
 	std::vector<IdentHash> NetDb::GetExploratoryNonFloodfill (const IdentHash& destination, 
-		size_t num, const std::set<IdentHash>& excluded)
+		size_t num, const std::unordered_set<IdentHash>& excluded)
 	{
 		std::vector<IdentHash> ret;
 		if (!num || m_RouterInfos.empty ()) return ret; // empty list
diff --git a/libi2pd/NetDb.hpp b/libi2pd/NetDb.hpp
index 50f6b033..1a6c357f 100644
--- a/libi2pd/NetDb.hpp
+++ b/libi2pd/NetDb.hpp
@@ -10,7 +10,7 @@
 #define NETDB_H__
 // this file is called NetDb.hpp to resolve conflict with libc's netdb.h on case insensitive fs
 #include <inttypes.h>
-#include <set>
+#include <unordered_set>
 #include <unordered_map>
 #include <string>
 #include <thread>
@@ -95,12 +95,12 @@ namespace data
 			std::shared_ptr<const RouterInfo> GetRandomRouter () const;
 			std::shared_ptr<const RouterInfo> GetRandomRouter (std::shared_ptr<const RouterInfo> compatibleWith, bool reverse, bool endpoint) const;
 			std::shared_ptr<const RouterInfo> GetHighBandwidthRandomRouter (std::shared_ptr<const RouterInfo> compatibleWith, bool reverse, bool endpoint) const;
-			std::shared_ptr<const RouterInfo> GetRandomSSU2PeerTestRouter (bool v4, const std::set<IdentHash>& excluded) const;
-			std::shared_ptr<const RouterInfo> GetRandomSSU2Introducer (bool v4, const std::set<IdentHash>& excluded) const;
-			std::shared_ptr<const RouterInfo> GetClosestFloodfill (const IdentHash& destination, const std::set<IdentHash>& excluded) const;
+			std::shared_ptr<const RouterInfo> GetRandomSSU2PeerTestRouter (bool v4, const std::unordered_set<IdentHash>& excluded) const;
+			std::shared_ptr<const RouterInfo> GetRandomSSU2Introducer (bool v4, const std::unordered_set<IdentHash>& excluded) const;
+			std::shared_ptr<const RouterInfo> GetClosestFloodfill (const IdentHash& destination, const std::unordered_set<IdentHash>& excluded) const;
 			std::vector<IdentHash> GetClosestFloodfills (const IdentHash& destination, size_t num,
-				std::set<IdentHash>& excluded, bool closeThanUsOnly = false) const;
-			std::vector<IdentHash> GetExploratoryNonFloodfill (const IdentHash& destination, size_t num, const std::set<IdentHash>& excluded);
+				std::unordered_set<IdentHash>& excluded, bool closeThanUsOnly = false) const;
+			std::vector<IdentHash> GetExploratoryNonFloodfill (const IdentHash& destination, size_t num, const std::unordered_set<IdentHash>& excluded);
 			std::shared_ptr<const RouterInfo> GetRandomRouterInFamily (FamilyID fam) const;
 			void SetUnreachable (const IdentHash& ident, bool unreachable);
 			void ExcludeReachableTransports (const IdentHash& ident, RouterInfo::CompatibleTransports transports);
@@ -139,8 +139,6 @@ namespace data
 			std::shared_ptr<IdentityEx> NewIdentity (const uint8_t * buf, size_t len) { return m_IdentitiesPool.AcquireSharedMt (buf, len); };
 			std::shared_ptr<RouterProfile> NewRouterProfile () { return m_RouterProfilesPool.AcquireSharedMt (); };
 
-			uint32_t GetPublishReplyToken () const { return m_PublishReplyToken; };
-
 		private:
 
 			void Load ();
@@ -189,9 +187,6 @@ namespace data
 			/** router info we are bootstrapping from or nullptr if we are not currently doing that*/
 			std::shared_ptr<RouterInfo> m_FloodfillBootstrap;
 
-			std::set<IdentHash> m_PublishExcluded;
-			uint32_t m_PublishReplyToken = 0;
-
 			std::vector<std::shared_ptr<const RouterInfo> > m_ExploratorySelection;
 			uint64_t m_LastExploratorySelectionUpdateTime; // in monotonic seconds
 
diff --git a/libi2pd/NetDbRequests.cpp b/libi2pd/NetDbRequests.cpp
index 85e3249f..08d5536c 100644
--- a/libi2pd/NetDbRequests.cpp
+++ b/libi2pd/NetDbRequests.cpp
@@ -12,6 +12,7 @@
 #include "NetDb.hpp"
 #include "NetDbRequests.h"
 #include "ECIESX25519AEADRatchetSession.h"
+#include "RouterContext.h"
 
 namespace i2p
 {
@@ -19,8 +20,10 @@ namespace data
 {
 	RequestedDestination::RequestedDestination (const IdentHash& destination, bool isExploratory, bool direct):
 		m_Destination (destination), m_IsExploratory (isExploratory), m_IsDirect (direct), m_IsActive (true),
-		m_CreationTime (i2p::util::GetSecondsSinceEpoch ()), m_LastRequestTime (0) 
+		m_CreationTime (i2p::util::GetSecondsSinceEpoch ()), m_LastRequestTime (0), m_NumAttempts (0)
 	{
+		if (i2p::context.IsFloodfill ())
+			m_ExcludedPeers.insert (i2p::context.GetIdentHash ()); // exclude self if floodfill
 	}
 		
 	RequestedDestination::~RequestedDestination () 
@@ -42,6 +45,7 @@ namespace data
 		if(router)
 			m_ExcludedPeers.insert (router->GetIdentHash ());
 		m_LastRequestTime = i2p::util::GetSecondsSinceEpoch ();
+		m_NumAttempts++;
 		return msg;
 	}
 
@@ -67,17 +71,11 @@ namespace data
 		m_ExcludedPeers.clear ();
 	}
 
-	std::set<IdentHash> RequestedDestination::GetExcludedPeers () const 
+	std::unordered_set<IdentHash> RequestedDestination::GetExcludedPeers () const 
 	{ 
 		std::lock_guard<std::mutex> l (m_ExcludedPeersMutex);
 		return m_ExcludedPeers; 
 	}
-
-	size_t RequestedDestination::GetNumExcludedPeers () const 
-	{ 
-		std::lock_guard<std::mutex> l (m_ExcludedPeersMutex);
-		return m_ExcludedPeers.size (); 
-	}
 		
 	void RequestedDestination::Success (std::shared_ptr<RouterInfo> r)
 	{
@@ -231,7 +229,7 @@ namespace data
 	{
 		if (!dest || !dest->IsActive ()) return false;
 		bool ret = true;
-		auto count = dest->GetNumExcludedPeers ();
+		auto count = dest->GetNumAttempts ();
 		if (!dest->IsExploratory () && count < MAX_NUM_REQUEST_ATTEMPTS)
 		{
 			auto nextFloodfill = netdb.GetClosestFloodfill (dest->GetDestination (), dest->GetExcludedPeers ());
diff --git a/libi2pd/NetDbRequests.h b/libi2pd/NetDbRequests.h
index 2b398fd5..1f78fde6 100644
--- a/libi2pd/NetDbRequests.h
+++ b/libi2pd/NetDbRequests.h
@@ -11,7 +11,7 @@
 
 #include <inttypes.h>
 #include <memory>
-#include <set>
+#include <unordered_set>
 #include <unordered_map>
 #include "Identity.h"
 #include "RouterInfo.h"
@@ -21,7 +21,7 @@ namespace i2p
 {
 namespace data
 {
-	const size_t MAX_NUM_REQUEST_ATTEMPTS = 5;
+	const int MAX_NUM_REQUEST_ATTEMPTS = 5;
 	const uint64_t MANAGE_REQUESTS_INTERVAL = 1; // in seconds
 	const uint64_t MIN_REQUEST_TIME = 5; // in seconds
 	const uint64_t MAX_REQUEST_TIME = MAX_NUM_REQUEST_ATTEMPTS * (MIN_REQUEST_TIME + MANAGE_REQUESTS_INTERVAL);
@@ -39,8 +39,8 @@ namespace data
 			~RequestedDestination ();
 
 			const IdentHash& GetDestination () const { return m_Destination; };
-			size_t GetNumExcludedPeers () const;
-			std::set<IdentHash> GetExcludedPeers () const;
+			std::unordered_set<IdentHash> GetExcludedPeers () const;
+			int GetNumAttempts () const { return m_NumAttempts; };
 			void ClearExcludedPeers ();
 			bool IsExploratory () const { return m_IsExploratory; };
 			bool IsDirect () const { return m_IsDirect; };
@@ -62,9 +62,10 @@ namespace data
 			IdentHash m_Destination;
 			bool m_IsExploratory, m_IsDirect, m_IsActive;
 			mutable std::mutex m_ExcludedPeersMutex;
-			std::set<IdentHash> m_ExcludedPeers;
+			std::unordered_set<IdentHash> m_ExcludedPeers;
 			uint64_t m_CreationTime, m_LastRequestTime; // in seconds
 			RequestComplete m_RequestComplete;
+			int m_NumAttempts;
 	};
 
 	class NetDbRequests: public std::enable_shared_from_this<NetDbRequests>
diff --git a/libi2pd/RouterContext.h b/libi2pd/RouterContext.h
index 941974b2..2a1f4ef6 100644
--- a/libi2pd/RouterContext.h
+++ b/libi2pd/RouterContext.h
@@ -12,7 +12,7 @@
 #include <inttypes.h>
 #include <string>
 #include <memory>
-#include <set>
+#include <unordered_set>
 #include <boost/asio.hpp>
 #include "Identity.h"
 #include "RouterInfo.h"
@@ -255,7 +255,7 @@ namespace garlic
 			// publish
 			std::unique_ptr<RouterService> m_Service;
 			std::unique_ptr<boost::asio::deadline_timer> m_PublishTimer, m_CongestionUpdateTimer, m_CleanupTimer;
-			std::set<i2p::data::IdentHash> m_PublishExcluded;
+			std::unordered_set<i2p::data::IdentHash> m_PublishExcluded;
 			uint32_t m_PublishReplyToken;
 			bool m_IsHiddenMode; // not publish
 	};
diff --git a/libi2pd/SSU2.cpp b/libi2pd/SSU2.cpp
index 576b9cec..15d54395 100644
--- a/libi2pd/SSU2.cpp
+++ b/libi2pd/SSU2.cpp
@@ -1047,7 +1047,7 @@ namespace transport
 	}
 
 	std::list<std::shared_ptr<SSU2Session> > SSU2Server::FindIntroducers (int maxNumIntroducers,
-		bool v4, const std::set<i2p::data::IdentHash>& excluded) const
+		bool v4, const std::unordered_set<i2p::data::IdentHash>& excluded) const
 	{
 		std::list<std::shared_ptr<SSU2Session> > ret;
 		for (const auto& s : m_Sessions)
@@ -1078,7 +1078,7 @@ namespace transport
 		uint32_t ts = i2p::util::GetSecondsSinceEpoch ();
 		std::list<i2p::data::IdentHash> newList, impliedList;
 		auto& introducers = v4 ? m_Introducers : m_IntroducersV6;
-		std::set<i2p::data::IdentHash> excluded;
+		std::unordered_set<i2p::data::IdentHash> excluded;
 		for (const auto& it : introducers)
 		{
 			std::shared_ptr<SSU2Session> session;
diff --git a/libi2pd/SSU2.h b/libi2pd/SSU2.h
index be643272..d81acf6f 100644
--- a/libi2pd/SSU2.h
+++ b/libi2pd/SSU2.h
@@ -10,6 +10,7 @@
 #define SSU2_H__
 
 #include <unordered_map>
+#include <unordered_set>
 #include <mutex>
 #include "util.h"
 #include "SSU2Session.h"
@@ -127,7 +128,7 @@ namespace transport
 
 			void ConnectThroughIntroducer (std::shared_ptr<SSU2Session> session);
 			std::list<std::shared_ptr<SSU2Session> > FindIntroducers (int maxNumIntroducers,
-				bool v4, const std::set<i2p::data::IdentHash>& excluded) const;
+				bool v4, const std::unordered_set<i2p::data::IdentHash>& excluded) const;
 			void UpdateIntroducers (bool v4);
 			void ScheduleIntroducersUpdateTimer ();
 			void HandleIntroducersUpdateTimer (const boost::system::error_code& ecode, bool v4);
diff --git a/libi2pd/Transports.cpp b/libi2pd/Transports.cpp
index e4191fd2..9a10ca72 100644
--- a/libi2pd/Transports.cpp
+++ b/libi2pd/Transports.cpp
@@ -708,7 +708,7 @@ namespace transport
 		if (ipv4 && i2p::context.SupportsV4 ())
 		{
 			LogPrint (eLogInfo, "Transports: Started peer test IPv4");
-			std::set<i2p::data::IdentHash> excluded;
+			std::unordered_set<i2p::data::IdentHash> excluded;
 			excluded.insert (i2p::context.GetIdentHash ()); // don't pick own router
 			int testDelay = 0;
 			for (int i = 0; i < 5; i++)
@@ -746,7 +746,7 @@ namespace transport
 		if (ipv6 && i2p::context.SupportsV6 ())
 		{
 			LogPrint (eLogInfo, "Transports: Started peer test IPv6");
-			std::set<i2p::data::IdentHash> excluded;
+			std::unordered_set<i2p::data::IdentHash> excluded;
 			excluded.insert (i2p::context.GetIdentHash ()); // don't pick own router
 			int testDelay = 0;
 			for (int i = 0; i < 5; i++)