vGPU performance quirks with M10's and XenDesktop 7.1x

Performance is ok in some cases and we can get around 56 FPS consistently.

However the start-menu seems sluggish.

Moving windows with or without show contents option is jumpy.

If enable "lossless" the startmenu and window moving is as good as local.
If I set "do not use video codec" the same as a above, windows performance is snappy.

Endpoints are HP ThinPro T730’s and CPU never seems high on those.
VDA OS Win10 1607
VDA HW 6cpu and 12gb of ram
GPU Profile is M10-1B
Driver v370.12