Bug

This article describes a bug that dramatically reduces file copy performance on Windows systems. I cannot provide a fix (not having access to the Windows source code), but I have found a workaround.

I just found out the following, which does not seem to be documented anywhere: The Windows API has a function for displaying a dialog that lets the user select a specific performance counter from all counters available on the local or a remote computer. The dialog is used by perfmon.exe, for example, and looks like this: