The link is to a forum post at Microsoft's TechNet about how moving, deleting or otherwise manipulating large files seems to take forever on Vista machines. I don't know if this applies to all Vista machines or just some, but it certainly did apply to mine and is one of the most aggravating things about Vista, in my opinion. The thread is one of the longest seen lately on TechNet.
Microsoft has little or nothing to say on the subject (depending on your interpretation and opinion of their statements) and the idea of a fix has not been mentioned. At least not yet.