Standalone limited to 45 fps instead of 90fps

Development Platform & Builds XR Development
1

Working on Vive.

In VRPreview we get a solid 90fps.

With standalone running with -fullscreen it is locked to 45fps. Seems like a vblank issue but I tried disabling vsync both via command and cvar.

Anyone know how to disable or fix?

2

Hey

I don’t know if this is your problem but I’ve seen similar things here, and it had to do with power saving settings on the graphics card - the FPS would start at 90 but then head down to 45.

3

I have now ruled out card and driver settings. I can force VSync off at the driver level and I get > 90FPS on VR Preview and ~50-55fps on standalone.

It clearly does something different in standalone mode than VR preview.

Any thoughts on other things to try?

4

from Epic helped us determine that the resolution for VR Preview was not being set correctly.

This is the Github fix:
https://github.com/EpicGames/UnrealEngine/commit/ebbb6da66e73446e03275857aa4b68394de14431