Recently my game has been running at 30fps or below (on max settings AND lowest settings). I have already tried reinstalling drivers, removing resource packs, allocating more RAM and reinstalling the game. My game used to run on 120fps or more but after moving my computer (desktop) it has been running slower.
BTW only Minecraft has low fps while every other game can run at 120
When I brought my computer over to my friends house one day, Minecraft suddenly was running at 30fps, no matter what settings I was playing on. Earlier that day I was able to play on 120fps and above (before I brought it over).
I've asked some of my friends about it and they have been unable to diagnose the problem.
Check and see if windows reset your screen to run at 30hz if not set it to a diffrent hz rate and back to what it was ive seen windows clock it slower randomly when changing screens. also if you have vsync on in the game it will clock to your screens refresh rate