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At the bottom of a page you can see "Request Time: .359375 - SERVER: WEB2" or similar. This can be hidden/displayed by a setting on your theme settings.
These can be used to notify us of load time issues. This is how long the server takes to process the page. There may still be bandwidth issues on the end point like slow internet connections and such. For those we recommend testing with www.internetsupervision.com. They test from many places across the globe and tell you file sizes, load times, and more.