at visualware »
myspeed.visualware.com/s ··· ion=USA: Chicago, Illinois&cm=no&ver=9&map=namerica&codec=speedstd&codectext=Standard View Socket&width=600&provtext=Visualware&provlink=http://www.visualware.com&width=600
click ROUTE on the right hand side, then Start at the top.
This is a "looking glass" type app, the route from the VW server to you.
My thought was you could run it direct and again through the VPN to see what happens.
Also most of the VW test support either a socket test or HTTP test the HTTP test has lower throughput but much greater stability