when i download some videos from you tube some download are fast, like for VEVO ithe download is fast but foer other videos it is 80% slow.same is the problem for other download. any suggestions?

There are a lot of factors. The data (videos) are stored across many computers. How fast some (or parts) are accessed depends upon the load (cpu, network, i/o) on specific components. You need to understand how big-data (Hadoop and Google's mass storage) read-mostly systems work. If you did, you would not be asking this question, but it is a good one nonetheless.

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