Solution to Vista speed problem on horizon?

Microsoft has released a public preview of Service Pack 1 for the Windows Vista operating system.  Because it is only a Release Candidate (RC), not a finished product, it should be approached with caution as it may not perform as expected on all systems.  But those who have installed it find that Vista is noticeably zippier.  The officially named Windows Vista Service Pack 1 RC Refresh is available here.