There's a new elisp JIT in emacs 28
https://emacsconf.org/2020/talks/38/
There's a new portable undump in emacs 27
https://www.masteringemacs.org/article/whats-new-in-emacs-27...
a couple of examples of very core features off the top of my head
https://emacsconf.org/2020/talks/38/
There's a new portable undump in emacs 27
https://www.masteringemacs.org/article/whats-new-in-emacs-27...
a couple of examples of very core features off the top of my head