I was on a random 'how do I make rust compile faster' when I re(discovered) the mold linker. Its WAY faster than ld, the default linker as it uses parallelization in order to make things faster.
Replacement is fairly easy, just mv ld to ld.old and symlink to mold executable. Here is the link for mold. I also added it to my software page. I normally don't bother mentioning software anymore, but this thing was too cool and affects ANYONE who compiles software.