Re: emacs rendering comparisson between emacs23 and emacs26.3

[Dmitry Gutov]

On 05.04.2020 22:03, Stefan Monnier wrote:
> > What's the difference between redisplay being slow and it being unable to
> > "keep up"? I don't understand, sorry.
> If there's already input waiting (because the next event already
> arrived) at the start of redisplay, then redisplay is short-circuited.
>
> Typically, in an auto-repeat circumstance, this will either not happen
> or happen on a whole batch of repetition.  So we say "can't keep up"
> because processing of one command (including redisplay) takes more time
> than the interval until the next command.

This agrees with my previous understanding.

> > And in this case, IIUC, jit-lock is part of redisplay.
> Yes, it often is when scrolling.

So would you agree that short-circuiting and skipping jit-lock while 
somebody leans on C-v is a good idea?