CPU is Bottlenecking for Some Reason

[Jack Morpho]

Hey guys! Lately I have been getting extreme drops in performance in all games after one day my CPU usage skyrocketed to 100% on the desktop. Before, CSGO on Ultra would easily get me over 240 FPS. Now, I hardly get 60-70 FPS when no player models are present, and when they are, i get an instant frop to 40 or - also as often - 30 FPS.
Before this happened, it was still acting crazy and I would stilI get 100% ON THE DESKTOP. So I took my PC after to fix by warranty and they told me to get an SSD (yes I know I was stupid I had dual drive system). So I did get one, installed windows and CSGO on it, and yes I can launch games, its just -as mentioned above- extremely worse than before. Any idea what I should do? BTW the CPU is still the bottleneck and reaches 100% on a regular basis. Any idea what to do?
The temps are definitely not the problem they are never over 40 degrees on any core.

 

[Jack Morpho]

I5 7600 non-k

 

[Jack Morpho]

I'll do that and I'll get back to you. Thanks!