Low client FPS

Today, my game's optimization is so bad for some reason; like, I get low frame rates and lots of stutters, to the point where I've noticed my PC a few minutes ago was having an issue of having like stutters, some the app icons on the lower part of my screen went missing for some reason, so I had to restart my PC and the PC itself is fine right now, but not Valorant.

How do I fix it?