Navigation API > API/Runtime > API/Runtime/Engine References Module Engine Header /Engine/Source/Runtime/Engine/Public/UnrealEngine.h Include #include "UnrealEngine.h" Syntax class FFrameEndSync Copy full snippetclass FFrameEndSync Remarks Special helper class for frame end sync. It respects a passed in option to allow one frame of lag between the game and the render thread by using two events in round robin fashion. Constructors Type Name Description FFrameEndSync () Destructors Type Name Description ~FFrameEndSync () Functions Type Name Description void Sync ( bool bAllowOneFrameThreadLag ) Syncs the game thread with the render thread.