We’re frequently asked about how to check both responsive design as well as page-load time for mobile web. And, “how can you test on the hundreds of Android devices)?
Here’s a partial list of what’s in our toolbox to address these issues:
In no particular order:
http://tools.pingdom.com (General speed tests and breakdown of problem areas)
http://www.howtogomo.com/en/d/ (Go at least 2x levels deep for in-depth reporting; this is from Google)
http://www.laurencegellert.com/software/css-responsive-design-testing-tool/ (New responsive design emulator)
http://quirktools.com/screenfly/
This just came out for testing Android (additional OS support pending), on real devices and emulators with one click – It’s extraordinary:





