SFTP Transfer performance... (Mac)

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http://hardforum.com – Trying to figure out how to get fast downloading going over SFTP, the server I'm downloading from has very high bandwidth speeds, my home connection is 30mbps, but my speeds are pretty slow depending on what client I use. Ex. FileZilla gets 300-800kbps, fluctuating very quickly.. Transmit gets 180kbps... What client has a very high number of concurrent threads? I'm assuming that's what I would need to use to get the highest transfer rate.. Or, should I be using HTTP with a download manager? (Hardware)