On Sat 30 Apr 2022 at 16:44 Lars Ingebrigtsen <larsi@gnus.org> wrote:

> Kirill Ignatiev <kirill.ignatiev@gmail.com> writes:
>
> > Often when I'm editing a file with many uncommon unicode symbols (e.g.,
> > in languages like haskell, julia or c++), and (I think) especially with
> > an ornate color theme, I experience delays of maybe about five seconds
> > when switching between buffers. Running emacs under lldb show a stack
> > trace below; I get a similar stack trace from running `emacs -Q` and
> > typing `C-h h` (`view-hello-file`), which takes quite a while to display
> > the hello file.
>
> (I'm going through old bug reports that unfortunately weren't resolved
> at the time.)
>
> Do you still see these delays in recent Emacs/OS versions?
>
> --
> (domestic pets only, the antidote for overdose, milk.)
>    bloggy blog: http://lars.ingebrigtsen.no
>
No, I don’t. This was such a long time ago, but between improvements to
emacs itself and using the unicode-fonts package I haven’t had font issues
in ages now.