Low CPU and GPU usage in League of Legends

Jul 22, 2018
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Hey,
I have a problem with low CPU and GPU usage in league of legends. I have gtx 780 and i7-4770k. This gives me around 150 fps in lol, but when it comes to more demanding moments i get below 100 which sometimes lags. Right now i have 60hz monitor so its okay to have around 120 fps, however im planning to buy 240hz one so it would be cool to have constant 250fps. Idk why but in league my cpu and gpu work on around 20%, when in games like final fantasy gpu works on 99% power. Does any1 know why this happens and can I somehow improve fps in lol? Here are screens from games.
https://imgur.com/a/oK9scZJ
https://imgur.com/a/Xy3eII6