Allow to set background FPS like we had with beta's MainLoop

ok, interesting because we’re not aware of changing gears when running in the background. what you set in the MainLoop node applies as a max in both fore and background.

so not really sure where this drop comes from. i do remember in the past there used to be a windows setting to generally degrade apps that don’t have the focus. wondering if this still exists and such could be the reason?