Samba drives me nuts XP is slow to crawl with it

[Gabriel Ambuehl]

I have a two IBM Thinkpads running XP Pro who should access a
Samba machine (3.0.0 on STABLE), one of them can do that perfectly,
the other gets about 100kb/s connection. Between each other, the work
at full speed and if I have the server mount shares from the Thinkpad,
it's fast as well. People on the net suggest deactivating webclient
service which I did, to no avail. Has anyone got any other pointers?