[Bug 689741] Re: libgtk2.0-0 performance problem due to unused cruft from 10 years ago

[Sebastien Bacher]

** Also affects: gtk via
   https://bugzilla.gnome.org/show_bug.cgi?id=637156
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/689741

Title:
  libgtk2.0-0 performance problem due to unused cruft from 10 years ago

Status in GTK+ GUI Toolkit:
  Unknown
Status in “gtk+2.0” package in Ubuntu:
  Triaged

Bug description:
  Binary package hint: libgtk2.0-0



After discussions with Owen Taylor it was found that GTK+ has a longstanding performance problem in cases where a program has a large number of GTK+ widgets on a window.

https://bugzilla.gnome.org/show_bug.cgi?id=637155
https://bugzilla.gnome.org/show_bug.cgi?id=637156

Removing  gtk_widget_reset_shapes() from the gtk_widget_set_style_internal() function in gtkwidget.c and rebuilding.reinstalling GTK+ results in a SIGNIFICANT performance improvement for applications which use a large number of widgets with GtkWindows.

Patch attached for  gtk+2.0_2.20.0-0ubuntu4, for ubuntu 10.04, however this bug applies to all GTK+ versions.

Source:  gtk+2.0_2.20.0-0ubuntu4

Distro tested on: Ubuntu 10.04,  however this bug is present in ALL GTK+ versions 

apt-cache policy libgtk2.0-0
libgtk2.0-0:
  Installed: 2.20.1-0ubuntu2
  Candidate: 2.20.1-0ubuntu2
  Version table:
 *** 2.20.1-0ubuntu2 0
        500 http://mirrors.ccs.neu.edu/ubuntu/ lucid-updates/main Packages
        100 /var/lib/dpkg/status
     2.20.0-0ubuntu4 0
        500 http://mirrors.ccs.neu.edu/ubuntu/ lucid/main Packages

Without this patch, GTK+ applications with a large number of widgets with GtkWindows will suffer higher CPU usage, and significantly slower performance.