Computer Slowed Down and I don't know why

SunnyDisposition

Prominent
Jul 15, 2017
5
0
510
3 days ago or so my PC stopped running properly, My FPS in most games has gone down to almost 1/3 of what it was before and I don't have any idea why.

Occasionally the performance returns but only when the fans go to that obnoxiously loud speed and then they'll slow down and my PC will drop in performance significantly again.

Running on Windows 10
 

SunnyDisposition

Prominent
Jul 15, 2017
5
0
510


I booted up CSGO while I had some background stuff running
CPU usage went from about 6% up to 25%, memory went from 25% to 35%
 

SunnyDisposition

Prominent
Jul 15, 2017
5
0
510


It says 100% maximum frequency on CPU