MSDN says those tcpwindowsize settings gives the max window size. windows starts slowly and increase if needed until this maximum is reached.
By default, those settings aren't in the registry, and are then defaulted to 16kB.
The farther you're trying to send, the larger the window should be. The bigger your internet connection, the bigger window size you'll need. Thus the formula that was pasted 12,000 times in this thread.
Your ftp server will keep throtling itself, waiting for acks from the remote server, if the window size is too small.
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