Why i have low FPS even with low settings?

I used to play LoL with 30FPS at medium settings and i was fine,but then one day my FPS keeps going from 30 to 15 and 21 and 25 etc.What is wrong?I lowered all settings and still the same!{{sticker:zombie-brand-mindblown}} What can i do?Can i fix this?Im using an Laptop and i have cooling base also. **Please help me :(** {{sticker:slayer-jinx-catface}}
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