[aftbit]

I don't know if this is still true, but for many years emacs used a horrible hack called "unexec" to obtain this startup performance.

https://lwn.net/Articles/673724/

[Jare]

That sounds similar to the "snapshot" feature Atom is using.

[mitchty]

It was only true for glibc as well, and its no longer true as unexec got ripped out of glibc recently as only emacs was using it.