Take a look at this workaround for Net::SFTP hanging on large file transfers. The problem has to do with servers rekeying SSH sessions and changing the version that your client reports to let the server know it's talking to a non-rekeying client.

As far as the slowness goes, you can try installing Math::BigInt::GMP

In reply to Re: Net:sftp module is slow and hangs by cengineer
in thread Net:sftp module is slow and hangs by rajeev

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