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What you're saying is that if I keep my end under 8.1 ms (which is 11.1 - 3) then I should be able to get 90 Hz but I'm doing that and WaitGetPoses is still taking forever.
However, if your application isn't feeding the gpu enough work to get started right at the top of the frame, then you will wind up with gpu bubbles -- areas of idle -- which will eat into that budget.
The best tool I know of for visualizing this is:
https://developer.valvesoftware.com/wiki/SteamVR/Installing_GPUView
Did you manage to fix the performance drop issue?
I also have trouble with WaitGetPose call.
When my rendering takes 1 ms, WaitGetPose will take 10 ms.
When my rendering takes 2.5 ms, WaitGetPose will take 20.2 ms.
When my rendering takes 3.6 ms, WaitGetPose will take 30.3 ms.
I feel I'm mad now...