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[Bug 529337]

 

Thanks, Paul. RESOLVED-FIXED but see my comment at the end about CPU use
in case it is important.

Yes with 3000 labels on Win 7 64-bit (2.4 GHz) I see the difference
between 2.1.2 release and HEAD when Karaoke is open.

Tested on Ubuntu 14.04 32-bit (Atom 1 GHz processor) with 1500 labels.
In 2.1.2 release it took 15 minutes to get the Karaoke window open, then
5 minutes to produce a single character in a label. In HEAD, Karaoke
window pops up almost at once and it takes a couple of seconds to type a
character in a label. Effects are responsive. On that machine in HEAD,
CPU use when typing a character in a label is 75% without Karaoke open
and 100% when Karaoke is open, but only a short burst at 100% compared
to 5 minutes at 100% is 2.1.2.

The comparable CPU usage on the Win 7 machine looks like 25% and 35%
respectively (about 8% when Audacity is idle). The usage seems quite
expensive (to me) considering typing a label currently doesn't write to
the .autosave file.

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https://bugs.launchpad.net/bugs/529337

Title:
  Hangs for a long time when editing labels on large files

Status in Audacity:
  Fix Released
Status in audacity package in Ubuntu:
  Triaged

Bug description:
  Binary package hint: audacity

  How to trigger this bug:

   1) Create a fairly long audio file (in this case 45 minutes)
   2) Create a label track with a bunch of long labels in it (i.e. transcriptions)
   3) Try to edit the text in one of the labels, preferably the first one

  Audacity will freeze for quite a long time.

  Actually label editing has a bunch of problems but this one is
  particularly bad...  It turns out that the code that's responsible is
  the "experimental lyrics window", which can be shown when you choose
  "Karaoke..." from the View menu.

  You can easily disable this "feature" by commending out the
  EXPERIMENTAL_LYRICS_WINDOW line in src/Experimental.h, which makes it
  possible to edit label texts.  But I'm sure some people out there
  actually use it...

  ProblemType: Bug
  Architecture: amd64
  Date: Sun Feb 28 00:57:02 2010
  DistroRelease: Ubuntu 9.10
  InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
  NonfreeKernelModules: nvidia
  Package: audacity 1.3.9-6
  ProcEnviron:
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.32-12.16-generic
  SourcePackage: audacity
  Uname: Linux 2.6.32-12-generic x86_64

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