How many PC that should act as virtual user in WAST
I ran a test using Microsoft Web Application Stress Tool. I have ran 2 same test but there are different in the number of PC that act as a client.The tests is for measuring the dowloaded time for 1,681,985 bytes data. For the first test, I only used 2 PC as client (master client + PC A). For the second test, I added another PC to be my client (master client + PC A + PC B). The PC A and B have similar configuration and processing power. My problem is from both test, they give me different values of TTFB but a bit similar in TTLB. For example
Test TTFB TTLB
1 59068.8 305595.5
2 649.6 30555842.7
SO, my doubt is there number of PC that acted as a client will affect the results of test, though there is NO error occured of display in the test report? How to make sure the PC that act as client is not overused while in testing using WAST tool?