How can I copy a big file from one Windows machine to another limiting speed transfer?
Use Robocopy with /IPG switch.
http://ss64.com/nt/robocopy.html for more info on RoboCopy
Use Robocopy with a
/IPG switch to limit bandwidth. Robocopy comes standard on Windows 7 and Windows 2008 Server
this link includes formula for figuring out maximum speed.