WaitForPresentOnGfxThread takes up most cpu usage

Unity Engine
,
1

I’ve been experimenting with shaders on android the last couple of days, and i noticed that the project slows down for seemingly no reason

on the profiler can be seen that GFX.WaitForPresentOnGfxThread takes up most of the time in the frames, but after looking at the GPU Ussage and Render Thread, i cant find a reason why it would go down to 15FPS except GPUProfiler.EndQueries
Profiler:

5407446--549138--upload_2020-1-25_14-20-21.png
5407446--549138--upload_2020-1-25_14-20-21.png1300×708 84.1 KB

it also seem that GPUProfiler.EndQueries is 2 frames behind

Does anyone know a reason for this and/or a reason why WaitForPresentOnGfxThread and GPUProfiler.EndQueries takes that long

2

This means it’s waiting for VSync.
GPUProfiler.EndQueries takes that long because it needs the results from the GPU when the GPU finishes the rendering.

Most likely your shaders are just too heavy :slight_smile:

3

is there a way to see how much time each shader individually takes up?
im trying to figure out how to improve the perfomance of the heavier shaders

4

Probably, using the tools provided by your device’s GPU vendor.