Re: emacs rendering comparisson between emacs23 and emacs26.3

[Eli Zaretskii]

> Cc: address@hidden, address@hidden, address@hidden, address@hidden,
>  address@hidden
> From: Dmitry Gutov <address@hidden>
> Date: Sun, 5 Apr 2020 22:25:16 +0300
> 
> >> Certainly a lower bar than having mouse-scrolling never lock up.
> > I'm not sure it is lower, because as I said an optimized Emacs doesn't
> > lock up when I scroll, either with C-v or the mouse.  But the problems
> > I described do happen in such builds.
> 
> It's lower because when you're typing you're usually typing something 
> meaningful (meaning limited input rate), and the beginning of the window 
> usually stays in place (which speeds up re-fontification).
> 
> Whereas when you're scrolling, you can scroll as fast as your keyboard 
> allows you, and you're triggering fontification of a whole new 
> screen-ful every keystroke.

And yet Emacs does cope with that "higher bar", whereas while I type I
sometimes see unbearably slow responses.  Which in my book doesn't fit
its being "lower bar".