I've had this gaming pc for about 6-7 months now but recently it's started massively deteriorating in performance and games that used to run on it fine are no longer running smoothly and are mostly unplayable. However my task manager is fine whenever I play these games and neither my CPU or GPU is anywhere near the limit. I've scanned for viruses using windows defender and found nothing. I've even cleaned out my fans and used a hardware monitoring software to check the temperatures of all my CPU and GPU and they both appear normal so I'm confused on what is wrong with my PC and what is slowing it down. Any ideas?