Re: The Emacs master is much slower than the emacs-27 branch.

[Stefan Monnier]

> system-configuration-features
> "XPM JPEG TIFF GIF PNG RSVG SOUND DBUS GSETTINGS GLIB NOTIFY INOTIFY ACL
> GNUTLS LIBXML2 FREETYPE HARFBUZZ XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11
> XDBE XIM MODULES THREADS LIBSYSTEMD PDUMPER LCMS2 GMP"
[...]
> system-configuration-features
> "XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND DBUS GSETTINGS GLIB NOTIFY
> INOTIFY ACL GNUTLS LIBXML2 FREETYPE HARFBUZZ ZLIB TOOLKIT_SCROLL_BARS
> GTK3 X11 XDBE XIM MODULES THREADS XWIDGETS LIBSYSTEMD PDUMPER LCMS2"

Hmm... so in Emacs-28, "you" removed XFT and GMP and replaced them with
CAIRO and XWIDGETS.

I doubt GMP and XWIDGETS make any difference, but maybe XFT or CAIRO
have something to do with the difference.

It might be worth fiddling with `--with(out)-xft` and
`--with(out)-cairo` to see if you can get closer to the origin of
the difference.


        Stefan