Sacrifice refresh interval and increase GPU occupancy, lowering the
final render time.
Lowers Blender 2.80 - Spring demo file form predicted 30min
measured 3 min to render 1/10th of samples) to about 7.5min.
It is still considerably higher than the master branch, which finishes
the file in just below 3 min, but it is already a better results.
The timing is from RTX 5000.
The viewport and CPU rendering should stay unaffected by this change.