dx-packages team mailing list archive

["Stephen M. Webb" <stephen.webb@xxxxxxxxxxxxx>]

This bug describes a menu performance problem encountered in 13.04 when
a browser is run with many hundreds of bookmarks.

An additional menu performance problem regarding multiple applications
was introduced in Saucy Salamander and a fix for 13.10 has not yet been
found.  This new problem compounds the existing bookmark-related
problem, and is tracked under bug #1199877.

We prefer to keep separate bugs separate, rather than mix multiple
(potentially) unrelated problems together into a single bug report,
because it makes tracking them and their consequent fixes much easier.
Less time spent on administrative issues means more time spent on actual
bug fixes.

It may turn out that both bugs have the same cause and software fix.  We
won't know until we fix one (or the other).  Work is indeed ongoing.

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https://bugs.launchpad.net/bugs/968533

Title:
  Alt-tab to Firefox sends Firefox to 100% CPU; unity-panel-service to
  80% CPU and hud-service to 20-80% CPU

Status in Unity:
  Confirmed
Status in “unity” package in Ubuntu:
  Confirmed

Bug description:
  I've been seeing UI hangs after switching tabs in Firefox, and
  switching from other applications to Firefox.

  It can take 3-8 seconds to change *tab*.  During this time the CPU is
  maxed out;  typical output from 'top' during this period shows 'hud-
  service' and 'unity-panel-service' combined using about the same CPU
  as Firefox itself:

   100 10.4  26:07.73 firefox            
    53  0.6   6:14.86 hud-service        
    38  1.5   6:42.14 unity-panel-service

  I suspect that the change is causing a (an inefficient) re-index
  related to updated menu structures.  (Eg. something like the history
  menu, although I can't see what it is as don't currently have a menu
  bar).

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