The problem is the speed of transfer - they commonly want to copy files on the order of 100 MB and this doesn't seem to work.
The software sits for 30+ minutes not making any progress copying (0 bytes) and sucking up CPU - I assume it is doing encryption, but it shouldn't take THAT long to do the encryption, should it?
Average PC around here is:
1.2 Ghz P IV
256 MB RAM etc.
This happens on all versions of WinSCP I've tried from 2 up to and including 3.5.5b.
How long should this be taking?