UI Hardware acceleration and other ways to improve CPU performance

So,
my CPU is really strained from BeamNG.drive. It's pretty low spec (Ryzen 3 3200G + R9 380 GPU) and gets me about 20FPS in a 5 player BeamMP Multiplayer game.
Note: This is not BeamMPs fault, since with paused physics in BeamNG I have satisfying 60FPS.
I've read about hardware acceleration, but can't find it. The UI is also part of my FPS losses when playing BeamNG, because lower UI resolution makes it run a bit better.
My GPU is stressed with 25% usage, so Hardware acceleration would be not of any problem.

Does anyone know how to?

 

Reduce graphics as low as possible, will make the game look bad but should help with fps.

 

When playing with friends I already reduced graphics to Low/Medium but the physics stay as straining as they are. At 6 cars my BeamNG officially reaches 15 FPS... All because of that CPU.

 

Where is the Hardware acceleration option, I can't seem to find it anywhere