Over the years I've spent some time developing a variety of testing processes to see how the new versions, SPs, fixes, and engines have impacted VSE performance. If you're interested in my previous findings you can find a link to those threads in my sig below.
All tests are performed a minimum of 4 times with the first run always being thrown out. Any outliers are also thrown out and retested. The system is disconnected from the internet and is never connected to an ePO system to prevent interference.
The new 5500 engine beta seems to help bring the java application execution back inline with the previous pre SP1 results. The System Scan values while better than SP1 are still significantly higher than the pre-SP1 version.