bug#32159: 26.1; inhibit-compacting-font-caches does not fix all fonts lagging issue

[Moses]

On Mon, Jul 16, 2018 at 11:34 AM Eli Zaretskii <eliz@gnu.org> wrote:
> > Nope...all characters in the HELLO file can be display correctly
> > without a problem, the lagging issue only appears while opening the
> > file. Once it already opened, there is no more slowdown.
>
> Okay, then what's your real-life use case?  I doubt you need
> to display HELLO very often, that was just an example, right?

Well, in my real-life case it is a little complicated. I often editing
files other than English, besides that, I use Emacs doing a lot of
things, such as Gnus to read news and Twitter-mode to read tweets.
Please assume all these jobs involve multiple languages. So if one
content makes Emacs slow down, then it seriously affects my daily
Emacs usage.

> That's why they don't slow down: their job is easier.

At least some optimize can be done, isn't it?