[Twisted-Python] delay when sending data over SSH

Hi Everybody, When I use channel.SSHChannel.self.conn.sendRequest from my client application it takes between 10-20 seconds until the server (which runs on the same machine) gets it! Does anybody has an idea, what's the problem? When I open a new channel, channel.SSHChannel.channelOpen responds directly. I do the sendRequest after I opened the channel. Thanks alot Tobias