Having web pages that load quickly can help make your website more effective. Fortunately, there are some excellent tools and services that allow you to test the load time of your web pages over different connection speeds and different devices.
Whichloadsfaster.com
Webpagetest.org
Showslow.com
Loadimpact.com
Neustar.biz
Developers.google.com/speed/pagespeed/
Tools.pingdom.com
Also, here are some tools that allow you to see what your web pages look like in different browsers and devices.
Browsershots.org
Offermobi.com
Browsercam.com
Here is an online tool to see how a site looks on an iPad.
Ipadpeek.com