When I'm in a world, any world, my game is running at around 1 to 0 Fps. I've tried allocating loads of different Gb's of RAM but nothing is changing. I've also tweaked with the graphics settings to try and get it to run better but nothing is improving. help

Does your log folder say that it's constantly saving chunks for each dimension? If so, I might have a similar issue.

latest.log

If you scroll down to the bottom, it does say that it's saving from multiple dimensions

There was just an obscene amount of singularities on the floor