We have a virtual NW 6.5 sp7 server that hosts a GW domain MTA and the webaccess client and agent.

It is EXTREMELY slow when users initially connect (1 min or more sometimes for the initial screen to come up) and then ... well, not fast after that, but OK.

Does anyone have particular perf tuning things, that you have found help the web application perform better?

Usually no more than 3-5 concurrent users (actually that would be peak). The win client is reasonably fast, for all 300 or so users. PostOffice is in a NW cluster.