"Subject: VPC 5.0.4 quick benchmarks
I just downloaded and updated Virtual PC from version 5.0.3 to 5.0.4 to see if the performance has increased.
Here are my quick results:
(Note - I graphed his results rather than posting the list of numbers. He listed times for 3 runs per test which I averaged for the graph. I asked if they were run back to back (cache effect possible) or if they were each run after a reboot.-Mike)

Test System: PowerBook G4/500/768MB/30GB/AP, Mac OS 10.1.5, all patches applied Windows System: 374MB RAM, Windows 2000 SP2, IE 6.0, all patches applied

Conclusion:
Most applications feel just as snappy as version 5.0.2. Most applications will get a 10-25% speed increase from VPC 5.0.3. I recommend that anyone with performance issues upgrade to version 5.0.4.
Thanks...Lee Givens "

If anyone has comparison results with applications performance send in your results. (Or if you see other pros/cons of the update.)

Virtual PC 5.04 Update: Connectix posted a page with a 5.04 update to Virtual PC (appx 10MB, English version) that includes a FTP download and a mirror site download. Here's a clip on the changes:

"Support Files for Virtual PC 5 for Mac
An Overview of Update 5.0.4 Connectix recently added many new features to Virtual PC, such as password protection, long file name support for shared folders, advanced COM port settings, additional networking options, and improved printing help. Virtual PC 5.0.4 includes these new features as well as numerous bug fixes. For more details please refer the Virtual PC 5.0.4 Read Me and New Features documents below.
* French, German, and Japanese 5.0.4 Updaters will be available soon. "

The page also links to stuffed (.sit files) of the Readme and list of New Features. (Some of the features mention 5.04, although I thought they were in 5.03 also.)