Hi @kazurayam , it’s not a matter of having different opinions, just analyze the facts (see screenshots Parallell.png,Sequential_firefox.png,Sequential_chrome.png).
total time sequential execution = 31.387s + 21.048s = 52.435s
total time parallel execution= 36.984s
difference sequential and parallel= 15.451s
this means that sequential execution is 15.451s slower than parallell ,parellel execution is 34,559% faster than sequential
The only variable to take into consideration in this scenario it’s the hardware capacity of your server to satisfy the nececessary hardware requirements when opening multiple browsers instances while executing test cases.
As to your observation with regard to the browser’s capability to run in parallel on a single machine,it’s very simple to verify, just create a Test Suite then create a Suite Collection containing the previous Test Suite created that will be executed in Chrome and Firefox, you’ll observe that both browsers are open at the same time,reducing execution time considerably (see screenshot Task manager.png).
