WaitForLastPresentationAndUpdateTime haust too much

I profiler the game and found that sometimes WaitForLastPresentationAndUpdateTime huast a lot .. I used occlusion in my game,will that have relation with this?

 

PS: This just occurs on certain position with certain direction in the scene... (My game was a first persion view)

 

https://docs.unity3d.com/2021.1/Doc...ate.WaitForLastPresentationAndUpdateTime.html

From the description it sounds like an external bottleneck, ie waiting for something to happen.
Check if your GPU is maxed out or something.

 

In my case, my GPU is maxed out when this is happening, definetly a sign that rendering is the bottleneck