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Emacs has tons of C code. And the display (and core text manipulation stuff IIRC) is not written in elisp.

In contrast, Atom just uses native code as the JIT, and then not only does (almost) everything in JS but also renders it with slow DOM.



I'm looking forward to Guile Emacs, if it ever gets merged into mainline, because emacs will then have a JIT (and maybe we can then land things like real threads)




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