Terrible Performance on Live Server

I get terrible performance on a live server. But I get solid performance on a training map inconsistently. I believe the culprit to be due to a very high rhit: figure. I don't know why this happens, or what rhit is. But I don't know how to fix this. I'm on linux btw, I fear to say that because I don't want my issue to be ignored due to me playing on linux. I've been able to sometimes get 100fps in training maps, but it's not a surefire thing either. But I've yet to get a live server match to work.
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Also if I run `HighResShot 320x200` It soft locks my game, and won't run. I've waited about a minute for it to stop being frozen, but it didn't fix itself.
I really want to be able to play the game that I bought with the understanding that my pc exceeded the recommend specs. But the game is quite literally unplayable. It's quite unacceptable.