Why is EPIC not developing the very own C++ dedicated compiler for UE

And how did you come to that realization? It’s probably the settings MagForceSeven supplied. When everything is in default setup, it most definitely uses all your cores (if you have enough memory to do so, which you may not)

You keep making a lot of claims, but not showing any data, or really telling us anything at all concrete.

VS is not broken.

What sort of i7 are you using? There’s an absolutely massive difference between an i7-4700 and an i7-10700, i know, i just made that leap.

Also, 32gb ram is a bit tight for large compilations.