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One recent change I cannot value high enough is optimizations which went into dealing with long lines. If you remember Emacs as being unusable as an editor for long lines, this is no more. I don't know if this went into 28.2 as I am happily using 29.0.50

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No, this will be part of Emacs 29.1, the changes part of 28.2 are relativly minor: https://git.savannah.gnu.org/cgit/emacs.git/tree/etc/NEWS?h=...

Are we talking about real optimizations? I remember some years ago (with v27.1?) there were some solution for long lines introduced which basically came down to just deactivating certain features like fontlock, etc.

> Are we talking about real optimizations?

Yes. The new fixes don't work by turning off features like so-long-mode does. And they remove the long lines penalty almost completely.

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