Resizing X frame is slow in Xubuntu when compositing is enabled

Bug #1385786 reported by Toshio Ito on 2014-10-26
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
emacs24 (Ubuntu)
Undecided
Unassigned

Bug Description

My environment:

- Xubuntu 14.04 (fresh installed)
- emacs24: 24.3+1-2ubuntu1
- xorg: 1:7.7+1ubuntu8
- Xorg driver: intel

Problem:

When "display compositing" is enabled, resizing X frame of Emacs is
slow, i.e., the frame cannot follow the cursor smoothly.

How to reproduce:

- Make sure "display compisting" is enabled.

    $ xfce4-settings-manager
    Select "Window Manager Tweaks"
    Select "Compositor" tab
    Check "Enable display compositing"

- Start Emacs in window mode

    $ emacs -q

- Resize the Emacs frame by dragging the frame edge.

Workaround:

Disable display compisiting.

It seems that the emacs window is rather slow when redrawing its content. I did some testing in a virtual environment on a low end host system and every application window was showing the delayed resizing behavior. Enabling the built-in compositor increased the delay somewhat.

no longer affects: xfwm4 (Ubuntu)
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