Memory allocation issues in 1.13.2 on startup

After updating to 1.13.2, Minecraft crashes from the loader screen, saying that it cannot allocate enough memory on the heap. It worked perfectly fine with the same settings in 1.13.1 before the update, and works in 1.13.2 in 64bit, although it has a ludicrously low frame rate (1 fps if I'm lucky). 1.13.1 now no longer works after the update. If I change the jvm arguments, there is no point where it will work; allocating enough RAM to avoid an out of memory error results in the above error being triggered. A copy of the launcher log is attached.