When I upload files with WinSCP only half of the bandwith is used for the actual upload.
The Windows network meter shows 5 MBit/s traffic used by WinSCP (this is also what I pay for to my ISP) but WinSCP transfers only about 220KiB/s. It should be over 500KiB/s if you do the math!
The command line version of Cygwin/SCP reaches around 600KiB/s connecting to the same server with the same file so it could not be a protocol overhead.
What is going wrong here?
I tried SFTP and SCP transfer with WinSCP 4.2.5 on Windows 7 Ultimate/64 bit.