I've seen Mas90 run using Citris and PC anywhere, both run fairly quickly since the local termanal doesn't actually do any of the work.
I am using a VPN for a remote site also, and it is slow over a 750K square dsl line, so I feel your pain. If you are using windows XP with SP2, make sure your software firewall is turned off for this, because that will really kill performance.
Hope that helps a bit.
ChaZ
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