Dropbox vs. Google Drive vs. Amazon vs. Skydrive: Which One Is Fastest? - ReadWrite - 0 views
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Dropbox ended up being fastest 56% of the time. Even more importantly, it was slowest only 4% of the time.
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Dropbox and Amazon appear to be the most reliable solutions with only occasional delays. Google isn't far behind, and I can't imagine that Microsoft won't work hard to improve Skydrive - the company's subscription model depends on it.