Vista 64 Remote Desktop SLOW to Win 2003 Server 64 on same domain

I have been using a new Vista business 64-bit desktop for a month or so. I
use Remote Desktop all the time, mostly to Windows XP x32, 2003 Server x32,
and 2000 Server x32 machines without a hitch.

However, we just installed a new server with Windows 2003 Enterprise x64
(these are all on the same domain, in the same rack, by the way) ... when I
remote desktop to that server from the Vista 64 desktop, remote desktop
performance is abysmal -- so SLOW it is unusable.

I couldn't find anything on the MS site regarding this issue, but the
following link:
http://www.vistax64.com/vista-networ...ion-issue.html

I've been hesitant to try this. Is there an official word on this from
Microsoft?