> In this profile, we can see that approximately 50% of the time is spent on WaitForSingleObject, but we know that is a part of the game’s normal rendering loop

> In this profile, we can see that approximately 50% of the time is spent on WaitForSingleObject, but we know that is a part of the game’s normal rendering loop so we can dismiss it as background noise. That's not an entirely safe assumption. Even a single threaded game could wait on different handles at different points in its logic.