Pausing physics slows down whole PC

I don't know if anyone else has had this problem, but I found if I pause the physics in BeamNG.Drive and switch out of the window, my entire computer slows down. Switching between windows is a lot slower and when typing I see a 1-3 second delay from what I type and when it appears on the screen, but if I keep the physics running without pausing and switch to another window everything runs at normal speed.

If I pause the physics however, the game camera keeps moving at normal speed, it's...

Pausing physics slows down whole PC