Re: emacs rendering comparisson between emacs23 and emacs26.3

[Richard Stallman]

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  > Recent Emacsen either ignore that variable or silently reset it to nil
  > internally so it doesn't get into their way.  Their progmodes either
  > always scan an entire buffer from its beginning or use some elaborate,
  > fragile techniques to find such a top level position.  Moreover, our
  > underlying mechanism for syntax highlighting always marks the entire
  > rest of a buffer as dirty after every single editing change.  This has
  > the consequence that that entire part has to be continuously rescanned
  > when some of it is shown in another window.

Does anyone disagree with this specific factual claim?

  > The basic slowness of Emacs over the past years is a direct consequence
  > of that policy.

Does anyone disagree with this general claim?

  > So since you earlier asked for "a switch to turn off the changes" then
  > my answer is that such a switch already exists but has been deactivated.

If those claims are true, I suggest reactivating it.
Why impose the fast=machine mode on everyone?

-- 
Dr Richard Stallman
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)