diff --git a/common/xash3d_types.h b/common/xash3d_types.h
index ac86cdea..6564cf93 100644
--- a/common/xash3d_types.h
+++ b/common/xash3d_types.h
@@ -145,7 +145,9 @@ typedef void (*setpair_t)( const char *key, const void *value, void *buffer, voi
 
 #define MAX_QPATH		64	// max length of a game pathname
 #if XASH_LOW_MEMORY == 2
-#define MAX_QPATH		32
+#define MAX_QPATH		32 // should be enough for singleplayer
+#elif XASH_LOW_MEMORY == 1
+#define MAX_QPATH 48
 #endif
 #define MAX_OSPATH		260	// max length of a filesystem pathname
 #define CS_SIZE		64	// size of one config string
diff --git a/engine/client/cl_parse.c b/engine/client/cl_parse.c
index 5fed0b8c..e70c6708 100644
--- a/engine/client/cl_parse.c
+++ b/engine/client/cl_parse.c
@@ -2754,8 +2754,11 @@ void CL_LegacyUpdateUserinfo( sizebuf_t *msg )
 	}
 	else memset( player, 0, sizeof( *player ));
 }
+#define MAX_LEGACY_RESOURCES 2048
 #if XASH_LOW_MEMORY == 2
-#define MAX_RESOURCES 64
+#define MAX_LEGACY_RESOURCES 1
+#elif XASH_LOW_MEMORY == 1
+#define MAX_LEGACY_RESOURCES 512
 #endif
 /*
 ==============
@@ -2770,13 +2773,16 @@ void CL_LegacyParseResourceList( sizebuf_t *msg )
 	static struct
 	{
 		int  rescount;
-		int  restype[MAX_RESOURCES];
-		char resnames[MAX_RESOURCES][MAX_QPATH];
+		int  restype[MAX_LEGACY_RESOURCES];
+		char resnames[MAX_LEGACY_RESOURCES][MAX_QPATH];
 	} reslist;
 	memset( &reslist, 0, sizeof( reslist ));
 
 	reslist.rescount = MSG_ReadWord( msg ) - 1;
 
+	if( reslist.rescount > MAX_LEGACY_RESOURCES )
+		Host_Error("MAX_RESOURCES reached\n");
+
 	for( i = 0; i < reslist.rescount; i++ )
 	{
 		reslist.restype[i] = MSG_ReadWord( msg );
diff --git a/engine/common/common.h b/engine/common/common.h
index c5f9d46b..0d3b1ce2 100644
--- a/engine/common/common.h
+++ b/engine/common/common.h
@@ -144,6 +144,8 @@ typedef enum
 #if XASH_LOW_MEMORY == 2
 #define MAX_DECALS		256	// touching TE_DECAL messages, etc
 #define MAX_STATIC_ENTITIES	32	// static entities that moved on the client when level is spawn
+#elif XASH_LOW_MEMORY == 1
+#define MAX_STATIC_ENTITIES	128	// static entities that moved on the client when level is spawn
 #endif
 
 // filesystem flags
diff --git a/engine/common/net_ws.h b/engine/common/net_ws.h
index c7b1ac09..1b4c6671 100644
--- a/engine/common/net_ws.h
+++ b/engine/common/net_ws.h
@@ -30,7 +30,7 @@ typedef enum
 #define MAX_MULTICAST		8192	// some mods spamming for rain effect
 
 #define MAX_INIT_MSG		0x20000	// max length of possible message
-#if XASH_LOW_MEMORY == 2
+#if XASH_LOW_MEMORY
 #define MAX_INIT_MSG 0x8000
 #endif
 // net packets type
diff --git a/engine/common/netchan.h b/engine/common/netchan.h
index d6c11775..23ff2f7c 100644
--- a/engine/common/netchan.h
+++ b/engine/common/netchan.h
@@ -94,6 +94,11 @@ GNU General Public License for more details.
 	#define NUM_PACKET_ENTITIES		32
 	#define MAX_CUSTOM_BASELINES		8
 	#define NET_MAX_FRAGMENT		32768
+#elif XASH_LOW_MEMORY == 1
+#define SINGLEPLAYER_BACKUP		4
+#define NUM_PACKET_ENTITIES		64
+#define MAX_CUSTOM_BASELINES		8
+#define NET_MAX_FRAGMENT		32768
 #endif
 
 typedef struct netsplit_chain_packet_s
diff --git a/engine/common/protocol.h b/engine/common/protocol.h
index 404fabbb..8727c6e5 100644
--- a/engine/common/protocol.h
+++ b/engine/common/protocol.h
@@ -183,7 +183,7 @@ GNU General Public License for more details.
 #define FRAGMENT_LOCAL_SIZE		FRAGMENT_MAX_SIZE	// local connection
 
 #if XASH_LOW_MEMORY == 2
-// memory reduced protocol, not for use in multiplayer
+// memory reduced protocol, not for use in multiplayer (but still compatible)
 #define MAX_VISIBLE_PACKET		128
 #define MAX_VISIBLE_PACKET_VIS_BYTES	((MAX_VISIBLE_PACKET + 7) / 8)
 
@@ -194,16 +194,28 @@ GNU General Public License for more details.
 #define MAX_MODELS			512
 
 
-#define MAX_SOUNDS			512 // do not change MAX_SOUND_BITS
-#define MAX_SOUNDS_NONSENTENCE 2048
-
+#define MAX_SOUNDS			512
 #define MAX_CUSTOM			32
 
 #define MAX_DLIGHTS			16		// dynamic lights (rendered per one frame)
 #define MAX_ELIGHTS			32		// entity only point lights
 #define MAX_RENDER_DECALS		64		// max rendering decals per a level
+#define MAX_RESOURCES		1024
+#elif XASH_LOW_MEMORY == 1
+#define MAX_VISIBLE_PACKET		256
+#define MAX_VISIBLE_PACKET_VIS_BYTES	((MAX_VISIBLE_PACKET + 7) / 8)
+
+#define MAX_EVENTS			128
+
+#define MAX_SUPPORTED_MODELS		1024
+
+#define MAX_MODELS			1024
+
+#define MAX_CUSTOM			512
+
 #define MAX_RESOURCES		1024
 #endif
+
 // Quake1 Protocol
 #define PROTOCOL_VERSION_QUAKE	15