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[Bug 760814] Re: Compiz Very Slow and Choppy in Natty Classic


I've experienced similar issues with Unity, specifically freezing for
~10s when using the unity search function, and abnormally long hardrive
access times when logging in as well as longer boot times when compared
to using Ubuntu Classic.  I believe the problem may be hardware
specific.  I have Ubuntu 11.04 installed on both my laptop and netbook,
and Unity is much more responsive in my netbook than on my laptop (which
has a Intel Core i3).

Quick specs: 
  - Release Ver: 11.04
  - uname: Linux xxxxxx-N10J 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:50 UTC 2011 i686 i686 i386 GNU/Linux
  - Processor: Intel Atom N270 (1.6 GHz - 32bit)
  - Ram: 2 gb
  - Display Device: Geforce 9300m GS (using proprietary NVIDIA accelerated graphics driver (version current) [Recommended])

  - Release Ver: 11.04
  - uname: Linux xxxxxx-laptop 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:24 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
  - Processor: Intel Core i3 (2.13 GHz)
  - Ram: 4 gb
  - Display Device: Intel HD Graphics (non-proprietary drivers)

The problems I've noticed to not occur on my netbook.  No matter how
many times I type and retype entries in the Unity application search bar
I never experience a freeze or slowdown.  My boot times, login times,
and application launch times are all normal and comparable between my
Unity sessions and Ubuntu Classic sessions for my netbook.

My Core i3 laptop has several issues when I'm running Unity.  Whenever I
use the application search bar, my computer freezes for ~10s or so after
I type in ~5 characters after which it displays the results normally.
Booting into a Unity session takes approximately 25 seconds longer than
booting into a Ubuntu Classic session on my laptop as well.  And
lauching applications in Unity takes noticeable longer than when
launched from a Classic session.

So that's the general gist for me: For my netbook, Unity runs
beautifully.  For my laptop, Unity is a little laggy.  Unfortunately I
can't be sure of the cause.

I have tried disabling the compiz "Detect Refresh Rate" and "Sync to
Vblank" fixes to no avail.  I have not yet tried Unity 2D.

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  Compiz Very Slow and Choppy in Natty Classic

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