Low GPU usage and unstable fps :(

Hi, I have a problem getting 144 fps. So when the game starts my fps is 144 but a few minutes later it goes down to 90 and then goes up to 130 and for some reason League is ONLY using 9% of GPU. I've tried capping the frame rate to 144, turning off V-Sync but it didn't work :( {{sticker:zombie-brand-mindblown}} Specs: Intel core i7 - 8750H Nvidia GeForce RTX 2060 16 GB RAM Intel NVMe SSD 512 GB Any suggestions?
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