Question 100% CPU usage on some games

Mar 31, 2019
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While playing some games, for example Rainbow Six Siege my CPU gets up to 100% CPU usage. This is a big issue for me as It causes Input lag and makes the game unplayable for me. I have tried everything, closing unnecessary tabs, and limiting my fps.

I don't know if there is an actual fix for this I just may need to upgrade my CPU, but If anyone has any suggestions I would appreciate you helping.

Components:
CPU: I5 4590
GPU: GTX 970
RAM: Crucial 1600 mHz 8GB
MOBO: ASUS H81-PLUS
Windows 10