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There could be a no. of reasons for a low dwnld speed. One of these is a sharing in-turn allocation b/w users, the source('s) may have set limitations upon their uploads, the seemingly best sources might be busy so you're sent to a slower one ('s) instead. Or just because you're dwnlding from a good source, don't think you're going to be the only one. You'll most likely be sharing their bandwith with others.