Question

Is it possible to run together multiple instance of selenium browsers and each one will work for themselve which will increase speed?

i can run one like:

ISelenium selenium = new DefaultSelenium("localhost", 4444, "*chrome", "http://localhost/");
selenium.Start();

but how to open more of them and open page inside each one?

Answer 1

Check Selenium Grid:

(..) Stop waiting hours to get the results of your web acceptance builds! Selenium Grid transparently distribute your tests on multiple machines so that you can run your tests in parallel, (..) this will dramatically speeds up in-browser web testing

Getting started it’s very easy (http://selenium-grid.seleniumhq.org/get_started.html) and demo site is present too.