Compile times normal or my fault?

[ITwrx]

It looks like clang and gcc are only using one thread at a time while 
compiling. Is there a way to make the compilation process use all 12 of my 
threads at like 80% or something? or 10 threads at 100%? I thought i needed to 
just get a more powerful processor, but it seems like it's barely using the one 
i have...