Vista showed a seemingly large upgrade in file copy improvement, at least technically. The end user may not have thought so though, “Perhaps the biggest drawback of the algorithm, and the one that has caused many Vista users to complain, is that for copies involving a large group of files between 256KB and tens of MB in size, the perceived performance of the copy can be significantly worse than on Windows XP”.

Mark Russinovich, a software engineer from Microsoft, explains what the internals of file copying in XP and shows what improvements were made for Vista and Vista Service Pack 1.

http://blogs.technet.com/markrussinovich/archive/2008/02/04/2826167.aspx

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