Re: slow X11 frame creation and refresh after occlusion

[Robert Pluim]

>>>>> On Wed, 03 Feb 2021 16:52:15 -0500, Greg Klanderman <gak@klanderman.net> 
>>>>> said:

>>>>> On February 1, 2021 Robert Pluim <rpluim@gmail.com> wrote:
    Greg> (frame-parameter nil 'font-backend)
    Greg> (xfthb x)

    Greg> any suggestions for settings I can try?

    >> Configure '--with-cairo'. I'm hoping that will be more efficient in
    >> terms of loading fonts.

    Greg> OK I will have a look.  Is there any way to determine if font loading
    Greg> is causing significant delay?  And would that be an issue on
    Greg> subsequent to the first frame on a display?

Emacs does a bunch of font-related stuff every time you create a new
graphical frame. You could try running emacs under 'perf' to see if it
gives any insight.

    Greg> (emacs-version)
    Greg> "GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, X toolkit, Xaw3d 
scroll bars)
    Greg> of 2020-12-21, modified by Debian"

    >> Definitely not in there, it's master-only:

    >> $ git log --author rpluim@gmail.com --grep font

    >> commit 20d13e424fb2e7dcc5e6ea1848bca4376d22bab1
    >> Author: Robert Pluim <rpluim@gmail.com>
    >> Date:   Fri Sep 11 10:29:24 2020 +0200

    >> Stop querying for fonts as soon as a match is found

    Greg> OK, another good pointer.

    Greg> Did you have any ideas on my other email, and the finding that the
    Greg> 30-60 sec of lossage I am seeing when dragging one emacs frame over
    Greg> another seems related to not running a full blown desktop environment?

That one I have no idea about.

Robert