Quote Originally Posted by TheBigB View Post
Not sure what would cause the slowdown. Lower level buffering possibly?

There are a few other methods of copying files.

One is P-Invoking SHFileOperation

Another one would be to run XCOPY (example I found on Google); command line executions are harder to control in terms of error catching though.

And there might be some more ways.
I love this suggestion. Ive used this method for copying files before and its well worth the minor performance trade for P/Invoke. You get all the bells and whistles of the OS shell. You get the progress bar and those little dialogs that ask for overwrite permission when a file exists, the error dialogs for when a file is locked or there is no HD space. You get all these benefits which would save you from writing a lot of code. I strongly recommend this approach.