Hello guys. I have 20 fps in gmod and i can't play in DRP and other minigames normaly

There are configs for source engine games that help the games fps run smoothly and efficiently for low end computers. You can also make gmod a "priority application" which will end up having more of your computers power go towards it.

But let's be real if you can't run gmod with 60fps in 2018 then you need to get a new pc