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

[Mark]

Just as a point of reference I timed the opening of software-properties-
gtk on Lubuntu 11.10.

I initially ran software-properties-gtk a couple of times before timing
it. Timing consisted of running the command below, clicking the Cancel
button as soon as it appeared. With Core 2 Duo T8100 2.1GHz CPU I got

# time software-properties-gtk 
gpg: /tmp/tmpwGGX4v/trustdb.gpg: trustdb created

real	0m0.999s
user	0m0.704s
sys	0m0.084s

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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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