Log level affects transfer speed even if logging turned off

Using WinSCP 4.2.4 on Windows XP/Server, I had an issue with very low transfer speeds. I resolved it by setting "Logging level" (Options->Preferences->Logging) from "Debug 2" to "Normal". That this might have an effect wasn't obvious to me because I had the log turned off ("No log").

In winscp.ini:
SLOW:
[Configuration\Logging]
Logging=0
LogProtocol=2

FAST:
[Configuration\Logging]
Logging=0
LogProtocol=0

HTH

Thanks for your post. This bug has been added to tracker.