GUI Upload 1.000MiBi its OK but over WinSCP.com max 200

you can see my Problem in the titel.
my config.txt is


# GENERAL
option batch abort
option confirm off
option transfer automatic

#SCRIPT
open sftp://xxxxxxxxxxxxxx -hostkey="ssh-rsa 2048 xxxxxxxxxxxxx" -privatekey="xxxxxxxxxx"
cd jcbackup/datenbackup
put -speed=500 "E:\Datenbackup\Woche 1.bkf"
close
exit

the connection works fine and datatransfer too but the speed is very slow
over GUI i have not the problem

thanks a lot for helping
and sorry when this is a double post.... but i search 20 min in this forum and dont find the same problem

Can you post a log file both from GUI and script?