I tested the transfer time of two files, each about 100MB, from c:\...\folder1 to c:\...\folder2 on a windows XP with cygwin, no FTP.
winscp, SFTP protocol, 120 seconds, indicated speed 1700KB/s in maximum
winscp, SCP protocol, 100 seconds, indicated speed 2300KB/s in maximum
Dos scp 25 seconds
Dos cp 25 seconds
Dos copy 5 seconds
A faster winscp would be great, e.g. for using synchro, thanks.