HELP! 20 fps on minecraft on blade 15

So basically I've been having this problem since I got back from a 10-day break of not playing any Minecraft. before that, I would always get 300 fps but now I only get like 20 fps when I play. I've been researching this for many hours and It's starting to get sort of hopeless. Does anyone have a fix? please don't suggest simple things like uninstalling the game because I've tried all of that already.