The makefile supports compiling in parallel. For this, you can use the -j N make option, to start N processes.
For the packages and utils, the compilation is governed by fpmake, and make just starts fpmake.
The fpmake process can also compile in parallel, but this needs a separate option -T N. You need to specify this option in the FPMAKEOPT variable:
The last step of a normal compilation cycle is recompiling the compiler with whole program optimization. This can be turned off: