A performance measurement tool is developed to measure performance of a terminal server servicing multiple Clients who operate on remote systems in a farm of multiple PC's. Test scripts to simulate actual operating conditions are run on each PC Client-User over a sequence of time which varies the number of concurrently active PC Client-Users from a small number of Users to a vary large number of current Users. During this test period, a record is kept of designated simulated-user-initiated actions such as log-on times, time to open various application programs, and character entries thus to determine acceptable operating configurations.