Re: Redisplay slower in Emacs 28 than Emacs 27

[Stefan Monnier]

Lars Ingebrigtsen [2020-12-08 20:12:59] wrote:
> :data image, current sxhash, Fequal: 6.4s.
> :data image, NOOP sxhash, Fequal: 3.4s.

Maybe it's time we speed up `hash_string`.
There's a lot of room for improvement there, AFAICT, e.g.:
- work on `EMACS_UINT` chunks instead of `char` chunks.
- Bound the amount of work (e.g. do a max of, say, 10 chunks, equally
  spaced throughout the string).


        Stefan