What is ...tensionPreRenderView

…and what to do about it?

In a project that runs 90FPS+ on 4K resolution, as soon as I start the project in VR, frame rates drop to 45 and below.

“stat scenerendering” gives me this:

Profiling doesn’t bring me any help (but if someone wants to look at the output I can send it over…).

What to do? What to try next? “…tensionPreRenderView” doesn’t even match any documents on Google.

Okay, with the help of @Ale_32 I found the answer I think: SteamVR is dropping frames to reach 45FPS as soon as you get under 90FPS and filling the gaps with motion smoothing.

The (truncated) “’…tensionPreRenderView” must be what the engine shows as a filler to reach the resulting frame rate.

More info <here> and <here>

Thanks for sharing this @warnerV - I’m having a somewhat similar issue where the tensionPreRenderView metric pulses up and down somewhat randomly.

I’m also on a Rift, so sadly, it’s not to do with the motion smoothing.