WPF performance and .NET Framework Client Profile related blogs provided by Jossef Goldberg.
As I reported in this blog, layered Window performance was one of the top customer complaints that got fixed in WPF in .Net 3.5 / 3.0 SP1.
A QFE/Hotifx that improved Vista Layered Windows performance (up to 4x, depending on the machine characteristics, such as the video bus speed, the video bus type, etc) was available since July, 2007. However, since users had to call Microsoft PSS to obtain the hotfix, it was difficult for end-users to install.
Starting 1/22/2008, this hotfix is now available for direct end-user download from Microsoft Download Center.
As a developer you are welcome to point below download links from your WPF app or web site.
Download links to the hotfix:
Notes:
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On his WPF WTFs blog, Jerry looks like he has been very busy in his 5 months of blogging about WPF. 
As you know the .NET Framework 3.5 Service Pack 1 Beta download is now available. There are many improvements
The WPFPerf tool comprises of a suite of performance profiling tools that allow you to analyze the run-time
The WPFPerf tool comprises of a suite of performance profiling tools that allow you to analyze the run