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I've used a lot of different websites and systems to test my upload and download speed and ping. I find they vary considerably.
Which is the best and most accurate? Is it BT Wholesale the one to use? http://www.speedtest.btwholesale.com/
The BT Wholesale one is useful especially when the further diagnostics is used.
Another good choice is Thinkbroadband as it runs 2 different tests, single threaded and multi threaded.