gwibber new message field performs poorly

On my environment, the semi-transparent new message field performs very poorly on 11.10. At all times my CPU usage increases substantially while it's open, and typing lags. In some cases (not exactly sure what the parameters are), the field nearly hangs on text entry, to the point I have to restart Gwibber altogether.

I'm happy to provide debug information; I'm not opposed to the theory this is a configuration issue on my side; unfortunately there is now way to gracefully degrade the field to the point I can use Gwibber. This is a fresh install of a 11.10 pre-release build. If it helps, I have Nvidia proprietary drivers installed, and glxgears runs smoothly:

~$ glxgears
47852 frames in 5.0 seconds = 9568.410 FPS
47834 frames in 5.0 seconds = 9566.694 FPS
47654 frames in 5.0 seconds = 9530.287 FPS

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: gwibber 3.2.0.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
Date: Mon Oct 10 10:55:17 2011
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20111009)
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gwibber
UpgradeStatus: No upgrade log present (probably fresh install)