diff --git a/neo/CMakeLists.txt b/neo/CMakeLists.txt
index 78e8ff4ed..6248c5e57 100644
--- a/neo/CMakeLists.txt
+++ b/neo/CMakeLists.txt
@@ -875,6 +875,7 @@ elseif(APPLE)
 		sys/sys_local.cpp
 		sys/posix/posix_net.cpp
 		sys/posix/posix_main.cpp
+		sys/posix/posix_shared.cpp
 	)
 
 	set(src_sys_core
@@ -927,6 +928,7 @@ else()
 		sys/sys_local.cpp
 		sys/posix/posix_net.cpp
 		sys/posix/posix_main.cpp
+		sys/posix/posix_shared.cpp
 		sys/linux/main.cpp
 	)
 
diff --git a/neo/framework/Common.cpp b/neo/framework/Common.cpp
index 87d9df69c..2963f1a65 100644
--- a/neo/framework/Common.cpp
+++ b/neo/framework/Common.cpp
@@ -97,6 +97,9 @@ idCVar com_timestampPrints( "com_timestampPrints", "0", CVAR_SYSTEM, "print time
 idCVar com_timescale( "timescale", "1", CVAR_SYSTEM | CVAR_FLOAT, "scales the time", 0.1f, 10.0f );
 idCVar com_makingBuild( "com_makingBuild", "0", CVAR_BOOL | CVAR_SYSTEM, "1 when making a build" );
 idCVar com_updateLoadSize( "com_updateLoadSize", "0", CVAR_BOOL | CVAR_SYSTEM | CVAR_NOCHEAT, "update the load size after loading a map" );
+idCVar com_asyncClient ( "com_asyncClient", "0", CVAR_BOOL | CVAR_SYSTEM | CVAR_ARCHIVE, "run client and renderer asynchronous" );
+idCVar com_renderFPS( "com_renderFPS", "300", CVAR_INTEGER | CVAR_SYSTEM | CVAR_ARCHIVE, "frames per second to render" );
+idCVar com_clientFPS( "com_clientFPS", "60", CVAR_INTEGER | CVAR_SYSTEM | CVAR_ARCHIVE, "times per second the game is called" );
 
 idCVar com_product_lang_ext( "com_product_lang_ext", "1", CVAR_INTEGER | CVAR_SYSTEM | CVAR_ARCHIVE, "Extension to use when creating language files." );
 
@@ -2385,52 +2388,112 @@ idCommonLocal::Frame
 =================
 */
 void idCommonLocal::Frame( void ) {
-	try {
+	// Slow things a little bit down.
+	unsigned long long spintime = Sys_Microseconds();
+
+	while ( 1 ) {
+#if defined (__GNUC__) && (__i386 || __x86_64__)
+				asm("pause");
+#elif defined(__aarch64__) || (defined(__ARM_ARCH) && __ARM_ARCH >= 7) || defined(__ARM_ARCH_6K__)
+				asm("yield");
+#endif
+
+		if ( Sys_Microseconds() >= ( spintime - 5 ) ) {
+			break;
+		}
+	}
+
+	// Calculate timings.
+	static unsigned long long oldframetime;
+	unsigned long long newframetime = Sys_Microseconds();
+	unsigned long long frametime = newframetime - oldframetime;
+	oldframetime = newframetime;
 
-		// pump all the events
-		Sys_GenerateEvents();
+	static int clientdelta = 1000000;
+	static int renderdelta = 1000000;
 
-		// write config file if anything changed
-		WriteConfiguration();
+	bool clientframe = true;
+	bool renderframe = true;
 
-		// change SIMD implementation if required
-		if ( com_forceGenericSIMD.IsModified() ) {
-			InitSIMD();
+	if ( cvarSystem->GetCVarBool( "com_asyncClient" ) == true ) {
+		clientdelta += frametime;
+		renderdelta += frametime;
+
+		if ( clientdelta < ( 1000000 / cvarSystem->GetCVarInteger( "com_clientFPS" ) ) ) {
+			clientframe = false;
+		} else {
+			clientdelta = 0;
 		}
 
-		eventLoop->RunEventLoop();
+		if ( renderdelta < ( 1000000 / cvarSystem->GetCVarInteger( "com_renderFPS" ) ) ) {
+			renderframe = false;
+		} else {
+			renderdelta = 0;
+		}
+	}
 
-		com_frameTime = com_ticNumber * USERCMD_MSEC;
+	// Early return if no work has to be done.
+	if ( !clientframe && !renderframe ) {
+		return;
+	}
 
-		idAsyncNetwork::RunFrame();
+    // Rund the game.
+	try {
+		if ( clientframe ) {
+			// Pump the events.
+			Sys_GenerateEvents();
+
+			// Write config file (if anything changed).
+			WriteConfiguration();
+
+			// Change SIMD implementation if required.
+			if ( com_forceGenericSIMD.IsModified() ) {
+				InitSIMD();
+			}
+
+			eventLoop->RunEventLoop();
+			com_frameTime = com_ticNumber * USERCMD_MSEC;
+			idAsyncNetwork::RunFrame();
+		}
 
 		if ( idAsyncNetwork::IsActive() ) {
 			if ( idAsyncNetwork::serverDedicated.GetInteger() != 1 ) {
-				session->GuiFrameEvents();
-				session->UpdateScreen( false );
+				if ( clientframe ) {
+					session->GuiFrameEvents();
+				}
+
+				if ( renderframe ) {
+					session->UpdateScreen( false );
+				}
 			}
 		} else {
-			session->Frame();
+			if ( clientframe ) {
+				session->Frame();
+			}
 
-			// normal, in-sequence screen update
-			session->UpdateScreen( false );
+			if ( renderframe ) {
+				// normal, in-sequence screen update
+				session->UpdateScreen( false );
+			}
 		}
 
-		// report timing information
-		if ( com_speeds.GetBool() ) {
-			static int	lastTime;
-			int		nowTime = Sys_Milliseconds();
-			int		com_frameMsec = nowTime - lastTime;
-			lastTime = nowTime;
-			Printf( "frame:%i all:%3i gfr:%3i rf:%3i bk:%3i\n", com_frameNumber, com_frameMsec, time_gameFrame, time_frontend, time_backend );
-			time_gameFrame = 0;
-			time_gameDraw = 0;
-		}
+		if ( clientframe ) {
+			// report timing information
+			if ( com_speeds.GetBool() ) {
+				static int	lastTime;
+				int		nowTime = Sys_Milliseconds();
+				int		com_frameMsec = nowTime - lastTime;
+				lastTime = nowTime;
+				Printf( "frame:%i all:%3i gfr:%3i rf:%3i bk:%3i\n", com_frameNumber, com_frameMsec, time_gameFrame, time_frontend, time_backend );
+				time_gameFrame = 0;
+				time_gameDraw = 0;
+			}
 
-		com_frameNumber++;
+			com_frameNumber++;
 
-		// set idLib frame number for frame based memory dumps
-		idLib::frameNumber = com_frameNumber;
+			// set idLib frame number for frame based memory dumps
+			idLib::frameNumber = com_frameNumber;
+		}
 	}
 
 	catch( idException & ) {
diff --git a/neo/framework/Common.h b/neo/framework/Common.h
index c0400bb47..dd45bab4f 100644
--- a/neo/framework/Common.h
+++ b/neo/framework/Common.h
@@ -73,6 +73,9 @@ extern idCVar		com_showAsyncStats;
 extern idCVar		com_showSoundDecoders;
 extern idCVar		com_makingBuild;
 extern idCVar		com_updateLoadSize;
+extern idCVar		com_asyncClient;
+extern idCVar		com_renderFPS;
+extern idCVar		com_clientFPS;
 
 extern int			time_gameFrame;			// game logic time
 extern int			time_gameDraw;			// game present time
diff --git a/neo/framework/Session.cpp b/neo/framework/Session.cpp
index e1fee6220..93357c4b8 100644
--- a/neo/framework/Session.cpp
+++ b/neo/framework/Session.cpp
@@ -2606,12 +2606,16 @@ void idSessionLocal::Frame() {
 		minTic = latchedTicNumber;
 	}
 
-	while( 1 ) {
+	if ( cvarSystem->GetCVarBool( "com_asyncClient" ) == true ) {
 		latchedTicNumber = com_ticNumber;
-		if ( latchedTicNumber >= minTic ) {
-			break;
+	} else {
+		while( 1 ) {
+			latchedTicNumber = com_ticNumber;
+			if ( latchedTicNumber >= minTic ) {
+				break;
+			}
+			Sys_WaitForEvent( TRIGGER_EVENT_ONE );
 		}
-		Sys_WaitForEvent( TRIGGER_EVENT_ONE );
 	}
 
 	if ( authEmitTimeout ) {
diff --git a/neo/sys/posix/posix_shared.cpp b/neo/sys/posix/posix_shared.cpp
new file mode 100644
index 000000000..f13ec3b6d
--- /dev/null
+++ b/neo/sys/posix/posix_shared.cpp
@@ -0,0 +1,98 @@
+/*
+===========================================================================
+
+Doom 3 GPL Source Code
+Copyright (C) 1999-2011 id Software LLC, a ZeniMax Media company.
+
+This file is part of the Doom 3 GPL Source Code ("Doom 3 Source Code").
+
+Doom 3 Source Code is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+Doom 3 Source Code is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with Doom 3 Source Code.  If not, see <http://www.gnu.org/licenses/>.
+
+In addition, the Doom 3 Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 Source Code.  If not, please request a copy in writing from id Software at the address below.
+
+If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
+
+===========================================================================
+*/
+
+#include <time.h>
+#include <sys/time.h>
+
+/*
+================
+Sys_Microseconds
+================
+*/
+unsigned long long Sys_Microseconds() {
+#ifdef __APPLE__
+	// OSX didn't have clock_gettime() until recently, so use Mach's clock_get_time()
+	// instead. fortunately its mach_timespec_t seems identical to POSIX struct timespec
+	// so lots of code can be shared
+	clock_serv_t cclock;
+	mach_timespec_t now;
+	static mach_timespec_t first;
+
+	host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &cclock);
+	clock_get_time(cclock, &now);
+	mach_port_deallocate(mach_task_self(), cclock);
+
+#else // not __APPLE__ - other Unix-likes will hopefully support clock_gettime()
+
+	struct timespec now;
+	static struct timespec first;
+#ifdef _POSIX_MONOTONIC_CLOCK
+	clock_gettime(CLOCK_MONOTONIC, &now);
+#else
+	clock_gettime(CLOCK_REALTIME, &now);
+#endif
+
+#endif // not __APPLE__
+
+	if(first.tv_sec == 0)
+	{
+		long long nsec = now.tv_nsec;
+		long long sec = now.tv_sec;
+		// set back first by 1ms so neither this function nor Sys_Milliseconds()
+		// (which calls this) will ever return 0
+		nsec -= 1000000;
+		if(nsec < 0)
+		{
+			nsec += 1000000000ll; // 1s in ns => definitely positive now
+			--sec;
+		}
+
+		first.tv_sec = sec;
+		first.tv_nsec = nsec;
+	}
+
+	long long sec = now.tv_sec - first.tv_sec;
+	long long nsec = now.tv_nsec - first.tv_nsec;
+
+	if(nsec < 0)
+	{
+		nsec += 1000000000ll; // 1s in ns
+		--sec;
+	}
+
+	return sec*1000000ll + nsec/1000ll;
+}
+
+/*
+================
+Sys_Milliseconds
+================
+*/
+unsigned int Sys_Milliseconds() {
+	return (int)(Sys_Microseconds()/1000ll);
+}
diff --git a/neo/sys/sys_public.h b/neo/sys/sys_public.h
index fbac1a886..5eda327d2 100644
--- a/neo/sys/sys_public.h
+++ b/neo/sys/sys_public.h
@@ -115,9 +115,11 @@ void			Sys_DebugVPrintf( const char *fmt, va_list arg );
 // NOTE: due to SDL_TIMESLICE this is very bad portability karma, and should be completely removed
 void			Sys_Sleep( int msec );
 
-// Sys_Milliseconds should only be used for profiling purposes,
-// any game related timing information should come from event timestamps
-unsigned int	Sys_Milliseconds( void );
+// Sys_Milliseconds and Sys_Microseconds are used in the main loop and fpr
+// profiling purposes. any game related timing information should come from
+// event timestamps
+unsigned long long	Sys_Microseconds( void );
+unsigned int		Sys_Milliseconds( void );
 
 // returns a selection of the CPUID_* flags
 int				Sys_GetProcessorId( void );
diff --git a/neo/sys/threads.cpp b/neo/sys/threads.cpp
index a0fe7c8db..a7f3fe09f 100644
--- a/neo/sys/threads.cpp
+++ b/neo/sys/threads.cpp
@@ -53,15 +53,6 @@ void Sys_Sleep(int msec) {
 	SDL_Delay(msec);
 }
 
-/*
-================
-Sys_Milliseconds
-================
-*/
-unsigned int Sys_Milliseconds() {
-	return SDL_GetTicks();
-}
-
 /*
 ==================
 Sys_InitThreads
diff --git a/neo/sys/win32/win_shared.cpp b/neo/sys/win32/win_shared.cpp
index 7c6f09e26..0fae8fa03 100644
--- a/neo/sys/win32/win_shared.cpp
+++ b/neo/sys/win32/win_shared.cpp
@@ -101,3 +101,38 @@ Sys_SetPhysicalWorkMemory
 void Sys_SetPhysicalWorkMemory( int minBytes, int maxBytes ) {
 	::SetProcessWorkingSetSize( GetCurrentProcess(), minBytes, maxBytes );
 }
+
+/*
+================
+Sys_Microseconds
+================
+*/
+unsigned long long Sys_Microseconds() {
+	static LARGE_INTEGER freq = { 0 };
+	static LARGE_INTEGER base = { 0 };
+
+	if (!freq.QuadPart)
+	{
+		QueryPerformanceFrequency(&freq);
+	}
+
+	if (!base.QuadPart)
+	{
+		QueryPerformanceCounter(&base);
+		base.QuadPart -= 1001;
+	}
+
+	LARGE_INTEGER cur;
+	QueryPerformanceCounter(&cur);
+
+	return (cur.QuadPart - base.QuadPart) * 1000000 / freq.QuadPart;
+}
+
+/*
+================
+Sys_Milliseconds
+================
+*/
+unsigned int Sys_Milliseconds() {
+	return (int)(Sys_Microseconds()/1000ll);
+}