>> I'd actually prefer going into the other direction: preload much more than
>> now, and remove lots of stuff from
>> autoloads. This will probably need a different strategy for preloading
>> (Daniel's approach, or Rmacs, or an Elisp
>> LLVM compiler, ...).
> Given that load time is an issue, loading more stuff than strictly
> necessary seems to make very little sense to me.

IIUC, using Daniel's approach, it should be possible to preload using
mmap in a time that's largely independent from the size of the
preloaded file (or at least, with a small constant).