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[Bug 1005152] [NEW] Sluggish performance when using Compiz (Unity, GNOME Classic)


Public bug reported:

I've reported similar issues to this in the past, and mostly they have
been fixed. However, over a month after 12.04's release, I'm still
facing some hiccups related to overall performance.

When Compiz is running there seems to be a very slight delay when using
the mouse or keyboard. It's minor enough that I did not notice it until
I started using another DE for a while. But now that I see it, it's
quite noticeable.


- Keyboard input delay: Seems to be an extremely brief delay after
pressing a key, giving the illusion of using a physically sticky
keyboard. I type quite fast, so I can often see the characters
"trailing" behind my keystrokes. This can be demonstrated by opening a
text editor and holding down any character and letting go after a few
seconds; the characters briefly continue to show up on the screen after
the key is no longer pressed.

- Window "follows" the cursor when using swift dragging.

- Highlighting follows the cursor in a very noticeable way.

- Brief delay when clicking or using scroll wheel.

Expected result:

Performance should be identical to that of Unity 2d or GNOME fallback
(without effects). After using Unity 2d for a while, these delays are
extremely noticeable to me since switching back to Unity.


Originally I thought this was an issue with Fglrx. However, I tried it
out on other hardware and drivers with similar results. Unity 2d is
extremely responsive and quick, whereas Unity or GNOME Classic with
effects feels slightly sluggish. I also have features from amdccc
disabled (tear free, etc) which would normally cause lag.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: compiz 1:
ProcVersionSignature: Ubuntu 3.2.0-24.39-generic 3.2.16
Uname: Linux 3.2.0-24-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
CompizPlugins: [core,composite,opengl,decor,grid,regex,place,mousepoll,vpswitch,move,compiztoolbox,imgpng,resize,session,gnomecompat,animation,wall,unitymtgrabhandles,expo,workarounds,ezoom,fade,scale,unityshell]
Date: Sun May 27 09:34:23 2012
DistroCodename: precise
DistroVariant: ubuntu
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
PackageArchitecture: all
 PATH=(custom, no user)
SourcePackage: compiz
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: compiz (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug precise ubuntu

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  Sluggish performance when using Compiz (Unity, GNOME Classic)

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