What's up with the low FPS?

I used to play with a stable 50-70 FPS on middle settings. But for over a week now, my FPS is only around 20-30, in fights I can see a frame like every second so I'm unable to do anything productive, even though I put all settings to minimum. I though it was because League wasn't compatible with win 10 (I just changed from win 7 recently), but other teammates have been saying too that FPS in League has never been this bad. Does anyone else experience this/has any kind of fix or info on when it'll be fixed? The game is literally unenjoyable like this. I attempt a game or two sometimes, but I only realise that I just want the game to be over because it's a pain playing like this. {{sticker:sg-soraka}}
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