Question CPU Usage at 90-100% when launching Games

Feb 25, 2021
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Hey everyone, new here at Tom's Hardware and I'm hoping you lot may be able to help with an issue I've never had up until recently. I am by no means an expert, but I did frankenstein my PC together myself. If I'm in the wrong forum arena, please let.me know. Kinda new to the whole forum thing in general.

Recently, I've had a big issue running into sever PC lag when I launch a game. I can get away with games like Phasmophobia, Terraria, Minecraft, etc. Relatively low resource costing games. However, when I boot up Modern Warfare, Apex, or another more medium to high demanding game I run into sever PC lag. This lag isn't just applicable to the game itself. Its extremely slow when I tab out, try to perform another task, my mic gets muted in whatever chat I'm on, etc. I've never had this issue before today. I run two monitors and have always been able to have multiple tabs and even games running at the same time with no issue. I don't use my Pc for anything other than school work and gaming so it's been a real disappointment to say the least. I suspect it may have something to do with my CPU but I'm not sure.

I run an i5-6600k with a NVIDIA 1660ti GPU. I have 32Gb of ran and the important software is installed on a dedicated SDD. if you need any other info I'll gladly answer any questions. Thanks for your input in advance! I'd really love to get my PC rolling again!
 

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