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OK, so it's not the most accurate measurement in the world, but hey, it kept me amused for a while. Select how much data you want to test with and hit submit to see what sort of speeds you're getting.

Note: The bigger chunk of data used, the more accurate it'll be. To demonstrate how this can make a difference, I've added the option to test your bandwidth with just 5 KB of data; try it to see how off the results are.
Choose how much data to test your bandwidth with: