Slow VPN PPTP Transfer Speeds vs. Windows XP

I recently switched my father to a new unibody MacBook after years of Windows XP heartache. He uses a VPN (PPTP) connection to access files on the Windows 2003 server at work.
*On the Mac (10.5.5), the file transfer speed over VPN is so slow that it is unusable.* Leopard can connect to the SMB server easily enough but clicking on a volume shows nothing until, after a 2-3 minute wait, the file list finally populates. The old Windows XP machine loads the volumes far quicker and is noticeably faster.
We are using the same credentials and settings as on the old machine, but nothing we do will speed up the connection so that it is actually usable.
Any thoughts or suggestions? At this stage I am extremely disappointed in the Mac's ability to integrate with enterprise. I was so sure the transition would be seamless but Leopard is making basic tasks much more difficult. It's egg on my face!
Help would be much appreciated!
Thanks, jd.
P.S. My apologies if this has already been discussed. Searching didn't give me many relevant results...

Hi Joe,
College networks can have a lot of unusual security monitoring systems in place, so it's conceivable that they limit non-PC speed, but as you said, you've checked that.
There is a known issue with some Gigabit Ethernet capable Macintosh systems and some switches. This problem can be fixed by software configuration, so it's possible Windows automatically does it, but MacOS doesn't. Have a look at the instructions specified in this Apple article and see if it helps: http://docs.info.apple.com/article.html?artnum=303660

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