I am very new at JMeter and am trying to get an idea of how to interpret the graphs below. The test I performed used 1 thread group with 600 users ramped up ever 5 seconds. What concerns me is the Average Response Time graph is flat. Does this mean the site being tested died early on or does it mean the site is so efficient it handled all the requests without a problem?
Also, is 600 user count with 5-second ramp-up the best way to try to put a load on the site?