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A comment on Paul Graham inspired the creation of Redis. Parent comment

Re:Paul Graham inspired the creation of Redis by tonyarkles on Wednesday March 27, 2019 @10:21AM (#19501006)
If I recall correctly, Emacs currently does this. During the build it (slowly) loads all of the elisp into memory and then dumps out the memory image of it after it’s all been compiled.

I’m a bit hazy on the details, but I think it involves calling unexec(). https://lwn.net/Articles/673724/

Edit: just noticed a sibling comment mentioned this too...

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Re:Paul Graham inspired the creation of Redis by Nullabillity on Wednesday March 27, 2019 @12:42PM (#19502785)
Only for built-in elisp, as part of the build process. User configuration (including packages) is reloaded from scratch on each start.
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