Question Jerky/laggy mouse movements when cpu @ 100% utilization

[CandyDealer21]

Okay so this issue has driven me nuts.
Whenever my CPU reaches 100% utilization, my mouse movements is all stuttery, laggy and jerky.

This started since I upgraded my GPU. I uninstalled my drivers with help from DDU.

SPECS:
i5 6400
MSI RTX 2060 (upgraded from 970)
8 GB Ram in single channel
1tb storage and 128 gb ssd
500w psu.

This issue has been driving me nuts, and I can't play any games anymore. This issue also only occurs when I'm gaming in full screen. I have tried windowed mode, and the stuttering is gone, but I'm then met with very low FPS and tons of stuttering.

I would really appreciate your help!

EDIT: My mouse is a Razer Deathadder Chroma that I got around 2 years ago. It hasn't been damaged or anything recently, so I wouldn't believe, that the issue is with my mouse. Especially because my mouse movements are perfect when just using chrome or being in desktop.

 

[rumple99]

Upgrade your cpu so its not running at 100% is the obvious answer

Secondly 8gb single channel ram is no good for gaming these days. When I play Battlefield 1 my ram usage is 12gb. When I play Elder Scolls Online my ram usage is 11gb

 

[CandyDealer21]

SOLVED: I just restarted my pc. Wtf.

Edit: it just came back again.