i do not want to ask something, but 5 Minutes ago something happend and this really surprised me.
I contacted the technical support and asked them so disable mod_gzip for my domain. And guess what!
The needed exactly 7 minutes and 20 seconds to disable it and sending the reply.
Dont know if thats normal at DH. But I know exactly, that this is not normal for all other Hosters I have been before.
Anyway... thanks a lot for the excellent support.