Finally I got a wired LAN access instead of this crappy WLAN connection. Now it works like a breeze and I even have access to a broader range of machines.
On the workside things are going around a bit without control. Two people are on vacation and the work concentrates on a few bottleneck employees. One of them is my group leader. I told him that I think that he has now too much work loaded on him but he doesn't think so... well.
I also have a hard time waiting for a new Wikipedia database dump. At this moment the Wikipedia and Wikimedia pages are down for "hardware maintenance". I hope this also involves a DB dump sooner or later...