My framerate has been messed up, as soon as i was forced to get the new launcher.

I first tried to get the new mc launcher at about the time of 1.12 pre-5. However, as soon as I got it, my framerate dropped 100 fps. I fixed it by going back to the old launcher, but when 1.12 came out, it automatically upgraded to the new launcher, and now i have an average of 1 fps.