Re: emacs rendering comparisson between emacs23 and emacs26.3

[Dmitry Gutov]

On 05.04.2020 22:06, Eli Zaretskii wrote:

> > What's the difference between redisplay being slow and it being unable
> > to "keep up"? I don't understand, sorry.
>
> That's not the important difference.  The important difference is that
> you want the input processed faster, without waiting for slow
> redisplay.

Two chief ways to do that are:

- To work faster
- To do less work

Ideally, we should take advantage of both. Skipping parts of redisplay 
could help with #2.

> > And in this case, IIUC, jit-lock is part of redisplay. And it's slow
> > enough for this to be noticeable.
>
> It isn't jit-lock that's slow, it's the fontification functions it
> calls.

Yes, obviously.