There were many priors about app speeds over the network and it varied with XP so to call it a 7 issue only means you didn't see the issue I found before across dozens of XP machines.
The same thing on XP was http://www.csie.ntu.edu.tw/~b90047/ebook/winXPhack/0596005113_winxphks-chp-5-sect-14.html
Most folk learned to turn that off so the speed went up. Now you need to look for same note for 7 and other Windows.
I have a Visual Basic 6 app (that my team developed) that reads files from a shared network folder and then processes them. It was installed on two Windows XP computers many years ago and has been working with no problems. Now we want to upgrade it to Windows 7. I have two different computers with Windows 7. When I connect the Windows 7 computers to the network and run the app (which has a File Watcher window) and am watching all 4 computers, I noticed that the File Watcher window of the XP boxes show the files about 2 seconds before the Windows 7 boxes see the files. What would cause this? Everything else in the app works as it should.
The apps are running as Administrator on the Windows 7 boxes and XP compatiblility mode. I have tried it both ways. (not as administrator and not in XP compatibility mode)
PS. If this is not the right forum please point me in the right direction.