Please read
Optimizing your number of Connections
To keep a connection going takes for a long time requires around 10 K Bytes per second. For 400 connections, that is 4000KB/sec or about 35Mbps (that is the equivalent to a "full channel" cable connection, or 8 DSL connections).
Usually, your optimal Connections per file =1 and you download multiple files at the same time to "fill your pipe" (maximize your downloading).
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