Amko
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Is it the download speed you're referring to? On torrents, it's limited only by the number of seeders (users sharing the files), but on sites like RapidShare and some others, the speed is intentionally restricted (sometimes, this is done to encourage people to buy paid accounts).
Also, servers are generally less busy at night, so pages load faster.
Also, servers are generally less busy at night, so pages load faster.