OK, I've to admit that I still use Windows for some tasks, even worse it's Windows Vista. The good point is that I use a virtualised version running on VirtualBox.
Unfortunately I faced some trouble with my network connection being quite slow while accessing network drives and internal server while the internet seemed to work very fine. I got so annoyed meanwhile that I started an investigation with Wireshark and figured out that I have lot's of error messages.
Most of them are incorrect TCP checksums, but quite a lot of retransmissions as well (besides all the broadcasts that you see in a Windows network which one could consider as errors as well ;-) ). Searching the net revealed that TCP checksum offloading could be the root of all evil which I found at Winfuture forum.
Especially the post about registry entries solved the problem for me eventually.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
"DisableTaskOffload"=1
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