Low fps till select another window

[ceecrb1]

Just testing out resolume avenue on a laptop.

With nothing running, fullscreen output to 2nd display, or just one simple video I only get 11-15 fps.
If I select any other window, say windows explorer, firefox etc OTHER than resolume's control window, it jumps up to locked 60fps and playback is butter smooth.
Re-select the resolume window and fps plummets.

pardon my french but...
WTF?

Suggestions?

[ceecrb1]

Video proof as this one has me totally confused.
This is on a "show laptop" aka no internet or crazy software, games etc.
W10 updated as are nvidia drivers.

https://youtu.be/ywpAAQsF2DQ

[ceecrb1]

FIXED.

Was latest nvidia drivers.
Uninstalled them and used the default long term stable version from the microsoft store/ windows update and all is perfect.