Compiz using large amounts of CPU when running Chrome

Description: Ubuntu oneiric (development branch)
Release: 11.10

As of the more recent Google Chrome beta and dev channel releases, Chrome, compiz and Xorg will sporadically use large amounts of CPU up. The problem only manifests itself in compiz and Xorg when it appears in Chrome, so one would suspect it's something Chrome is doing, but maybe compiz could be more resilient.

If it is a Chrome problem, it would be nice if I could squeeze some debugging out of compiz to prove this. Unfortunately, it appears to be non-deterministic, so I can't provide any steps to reproduce.

For reference, here's the output of top:

  PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
 4470 xxxxxxxx 20 0 1152m 78m 36m R 42 1.6 8:33.02 chrome
 2943 xxxxxxxx 20 0 864m 324m 65m R 34 6.5 16:31.23 compiz
 2120 root 20 0 411m 203m 42m S 26 4.1 9:13.03 Xorg

Let me know if you need me to provide any more info.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: compiz 1:0.9.6+bzr20110929-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 280.13 Wed Jul 27 16:53:56 PDT 2011
 GCC version: gcc version 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3)
.tmp.unity.support.test.0:

ApportVersion: 1.23-0ubuntu2
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,decor,grid,move,place,gnomecompat,session,mousepoll,compiztoolbox,wall,vpswitch,snap,regex,resize,imgpng,animation,workarounds,expo,ezoom,staticswitcher,fade,scale,unityshell]
CompositorRunning: compiz
Date: Fri Sep 30 12:01:12 2011
DistUpgraded: Fresh install
DistroCodename: oneiric
DistroVariant: ubuntu
DkmsStatus:
 nvidia-current, 280.13, 3.0.0-11-generic, x86_64: installed
 nvidia-current, 280.13, 3.0.0-12-generic, x86_64: installed
 vboxhost, 4.1.2, 3.0.0-12-generic, x86_64: installed
GraphicsCard:
 nVidia Corporation G71 [Quadro FX 1500] [10de:029e] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: nVidia Corporation Device [10de:032c]
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110921.2)
MachineType: Sun Microsystems Ultra20 M2
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=3998efb6-0b03-4533-9f64-971be98bb454 ro quiet splash vt.handoff=7
SourcePackage: compiz
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/24/2008
dmi.bios.vendor: Sun Microsystems
dmi.bios.version: 1.61.0
dmi.board.name: Ultra20 M2
dmi.board.vendor: Sun Microsystems
dmi.board.version: 1.61.0
dmi.chassis.type: 17
dmi.chassis.vendor: Sun Microsystems
dmi.modalias: dmi:bvnSunMicrosystems:bvr1.61.0:bd11/24/2008:svnSunMicrosystems:pnUltra20M2:pvr1.61.0:rvnSunMicrosystems:rnUltra20M2:rvr1.61.0:cvnSunMicrosystems:ct17:cvr:
dmi.product.name: Ultra20 M2
dmi.product.version: 1.61.0
dmi.sys.vendor: Sun Microsystems
version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.26-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20110811.g93fc084-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110411+8378443-1