today I dealt with the SU5 in VR and had the following experience.
It doesn’t explain to me why openXR behaves like this. in Steamvr I have around 38fps and frame times of 20ms. in 60hz Frequency on the Reverb 1 I can fly reasonably well with 30fps and motion vector. in openXR I have almost 60 FPS, so I would rather fly with openXR. to avoid stuttering I need motion vector in openXR, but then the FPS drop to 20. in 90hz I have 30fps. this explains to me only that openXR tries to calculate the FPS times three.
However at 60hz Frequency there should always be 20fps and not always 19fps and less, after all I have 59fps without motion vector in openXR.
anyway, openXR never seems to reach the display Frequency.
Software completely up-to-date (except for AMD graphics driver, a new one came yesterday) use the latest openXR component, i5 6600K @ 4.7Ghz, 32GB 3200 CL18, RX6900XT, Samsung 970Evo 500GB