Finally I got myself a new laptop that is the fastest thing I've ever used; this significant change in the hardware forced me to run the same test one more time, in case of results being importantly different. So, here are the graphs for the same two things (WIPS and TT.H). The parameters are the same as in the last post, though there is a slight difference: number of emulated browsers is 20 (red) and 40 (green).
As we can see, even though the number of browsers raised two times, the response time and throughput raised about 1.8 times, which is not exact number, but roughly estimated. Next time tests with replicated database will be run.