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

** Changed in: unity
    Milestone: 7.3.1 => 7.3.2

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https://bugs.launchpad.net/bugs/1091345

Title:
  Unity locks up while firefox bookmarks menu is opening

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

Bug description:
  A common usecase for firefox in Unity is holding down the mouse button
  and dragging across the firefox top menu items - File, Edit, View,
  History, Bookmarks, Tools, Help. If you accidentally touch Bookmarks
  while dragging across the other menu items, the whole Unity interface
  effectively locks itself up until the bookmarks menu finally appears.
  With just 2000 bookmarks at top-level, clicking the Bookmarks menu
  button takes 5 seconds before the menu appears on recent, very fast
  computers with 8-core CPUs. This is a serious usability issue.

  As the number of top-level bookmarks (bookmarks that are not stored in
  sub-folders) grows, the delay after clicking the Bookmarks menu button
  until the bookmarks popup menu appears gets longer. There is no disk
  I/O associated with the delay. It appears to be caused by purely CPU-
  bound activity.

  It seems the delay is perhaps O(n^2) or worse in the number of bookmark items contained at the top-level menu.
  This implies a poor choice or incorrect implementation of algorithms in sorting and / or displaying the bookmarks. With an efficient algorithm (ref. any good computer science textbook) correctly implemented, it should be possible to handle a vast number of top-level bookmarks without noticeable delay, perhaps 1,000,000s, until disk I/O starts to become an issue for first-run caching time.

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