What is "Frame Sync Time"

Development World Creation
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3

The time spent on synchronizing the game thread and renderer thread

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{
			SCOPE_CYCLE_COUNTER(STAT_FrameSyncTime);
			// this could be perhaps moved down to get greater parallelism
			// Sync game and render thread. Either total sync or allowing one frame lag.
			static FFrameEndSync FrameEndSync;
			static auto CVarAllowOneFrameThreadLag = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.OneFrameThreadLag"));
			FrameEndSync.Sync( CVarAllowOneFrameThreadLag->GetValueOnGameThread() != 0 );
}