Eli Zaretskii <eliz@gnu.org> writes:

>> Could we call `byte-compile' on the byte-compiler functions after loading them?
>
> Maybe, you will have to try.  The bootstrap of the byte compiler is
> somewhat tricky, given all the dependencies (see COMPILE_FIRST in
> lisp/Makefile.in).

So I tried moving the COMPILE_FIRST into loadup.el, which does bring
bootstrapping[1] down from 1m5s to 0m47s for me.  But IIUC it
reduces parallelism when compiling these files, so possibly it's
actually a loss overall.

[1]: Timed with compile-command = "rm -f bootstrap-emacs ../lisp/emacs-lisp/*.elc && time make bootstrap-emacs"