Low FPS since 9.1

I've been having low FPS on my laptop since 9.1 when playing on max graphics settings. Pre season 9 i didn't have any issues, it ran on over 150 fps at max settings. Suddenly it runs at 40 fps. I have gtx 940mx And i5 8350u with 8 gigs of ram. More than enough to max out this game. Can i get some help riot?
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