Re: Scrolling commands and skipping redisplay, was: Re: emacs rendering comparisson between emacs23 and emacs26.3

[Stefan Monnier]

> More generally, I don't think I see how even this proposal makes
> something clearly better.  We already have jit-lock-defer-time; people
> who have slow machines are advised to set that to something like 0.1
> or 0.25, and they can have scrolling that is way faster than with
> fast-but-imprecise-scrolling (and with the same tradeoff of making
> scrolling "imprecise").  Why invent kludges when we already have a
> better solution that was there since Emacs 21?

BTW, you can also set `jit-lock-defer-time` to 0 in which case jit-lock
is deferred iff there's input pending.
[ This refinement of `jit-lock-defer-time` was introduced last time
  this kind of discussion took place, which is also the time
  `fast-but-imprecise-scrolling` was introduced.  ]


        Stefan