I also considered to use Proxiware. But if it's true that they block google.com it's completely useless. It's like you buy a car without steering wheel or engine :D
My script need to change the threads number dynamically, e.g.: 9:00-10:00 i need 30 threads,10:00-11:00 40 threads ...
What should I do?
Dynamically increase the number of threads can not. Specify at once the maximum number of threads, and let the excess threads sleep. Or use the action "Call function in several threads".