Re: emacs rendering comparisson between emacs23 and emacs26.3

[Richard Stallman]

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  > It's not possible.  Bidirectional editing support in Emacs is
  > unconditional, it isn't an optional feature.

It isn't optional _now_ but maybe there is an opportunity to optimize
redisplay if the userssays "no BIDI".

Maybe some of the pre-bidi code could be brought back and used
when the user says there is no BIDI in the buffer.

  > What I would suggest is to compare with Emacs 24.1, which already
  > supported bidi.

It would be interesting to compare 24 and 23, to see what slowdown
there is.  And compare other subsequent versions to see what slowdown
there is.  These could give hints for what operations are worth trying
to optimize.

-- 
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)