how to optimize the setting in VR mode(Empty scene is still slow in HDRP)

Unity Engine
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1

hello community. I have followed this article and start to make some VR scene in HDRP.

I think I have already disable the unnecessary feature in the “HDRP asset settings”.
The setting file.
(HDRenderPipelineAsset.asset - Google Drive)

But the speed is still very slow. The same scene I have tested in URP can reach to 120 fps. But in HDRP, it’s just 30 to 50 fps. I have tired to remove the scene object and seems helpless.From the state window I can see the Cpu usage is very high.

Unity version 2019.3.2 . HDRP version 7.21

Does anybody have some suggestions?

Some update:
I found I double copy the XR Rig gameobject by accident. That’s the main reason why the fps is abnormal.

Still welcome any tips about VR optimization~ thanks

2

Can you tell about your setup? Are you running HDRP in DX11 or DX12? Which GPU?

DX12 is super slow atm.

3

It’s DX11.Mine is a laptop. CPU:i7-8750H GPU:RTX2080maxq

4

I found that disabling unnecessary frame settings can save a lot of CPU side overhead. Go to Project Settings → HDRP Default Settings, or disable on camera using custom frame settings overrides.

HDRP seems to add a lot of “trivial case” overhead. An empty scene I would expect to see lower frame rate than legacy RP. But,it should scale well with scene complexity.

If comparing performance, it’s also worth comparing build vs build. I get much higher framerates in build than in editor. 30-50 fps in the editor is not unusual for me in fairly complicated scenes but then I get a solid 90 in build. In the editor, use the performance profiler and just look at the camera render time to see if settings change makes a difference.

5

Wow ,thank u. That’s a very important tip to me. I found the reason why the scene is so slow. Have updated on the top~