FPS Problems

So, I used to play league with about 120 fps. And today I logged on during a ranked and it was hardstuck 50. Now, I'm sure everyones going to say the same "You can only see 60fps with human eyes", and my return is... it felt like i was in a constant lag. It just didn't work. I couldn't even last hit properly. I have the fps set to uncapped, and after windows 10 installed a new update, it won't go past 60, no matter what. It's rough for me. Any advice on how to fix it?

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