[Bug 1073728] Re: software sources window takes long time to open with little user feedback

[VinDSL]

Times are getting better.  Last week it took approx 60 sec. for Software
Sources window to appear.

Today, 37 seconds.  Still too long, IMO...

vindsl at Zuul:~$ date
Sun Dec  9 12:08:15 MST 2012

vindsl at Zuul:~$ time software-properties-gtk
real	0m37.081s
user	0m21.212s
sys	0m0.668s

~ VinDSL Unity Debug Script 12.12.06 (vindsl.com) ~
Current Date/Time: Sun Dec  9 12:10:13 MST 2012
Distro Release: Ubuntu Raring Ringtail (development branch)
Kernel Release: Linux 3.7.0-030700rc8-generic
Gnome Release: GNOME Shell 3.7.2
Unity Release: unity 6.6.0
OpenGL vendor string:   NVIDIA Corporation
OpenGL renderer string: GeForce 7600 GT/AGP/SSE2
OpenGL version string:  2.1.2 NVIDIA 304.64
Xserver Xorg Core Branch:
  Installed: 2:1.13.0.902+git20121207+server-1.13-branch.ede07c1a-0ubuntu0ricotz~quantal
Display Properties:
 lcd monitor:    Dell UltraSharp 1907FP (analog input)
  dimensions:    1280x1024 pixels (339x271 millimeters)
  resolution:    96x96 dots per inch

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https://bugs.launchpad.net/bugs/1073728

Title:
  software sources window takes long time to open with little user
  feedback

Status in “software-properties” package in Ubuntu:
  Confirmed

Bug description:
  I'm using Lubuntu 12.10 in a VirtualBox VM.

  Run Software Updater. When the main window opens, click the
  Settings... button at the bottom left. The settings window takes
  several seconds to appear, and other than the main window contents
  being greyed out, there is no indication that anything is happening.
  (The CPU appears to be maxed-out until the settings window opens, so
  the delay would probably be much longer on slower machines.)

  It would be good if a busy mouse pointer could be set, so the user
  knows something is happening, instead of possibly thinking that
  Software Updater has hung/locked up.

  Each time you click Settings... there is the same long delay while the
  CPU is maxed-out doing whatever it's doing. Would it be possible to
  cache whatever is being calculated in order to open the settings
  window? Then if the user selects Settings... again in the same
  session, the settings window could appear almost immediately.

  Another optimisation could be made for the delay after the user
  dismisses the settings window. If you close the settings window
  without making any changes, the CPU is again maxed-out for a few
  seconds before the Software Updater window is un-greyed-out. Since no
  changes were made, it should be possible for the Software Updater
  window to immediately become responsive in that case.

  This is similar to bug 1070868 but from a different starting point.
  Fixing bug 780776 would be one way of fixing this bug.

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