There is also a select call in the client loop that can be another cause delay. Select has the option of providing a timeout value, but the SSH2.pm code doesn't utilize it. The solution is discussed here:

Re^4: Net::SSH::Perl hangs(during cmd), but only in Mason environment

In reply to Re^4: Net::SSH::Perl ConnectTimeout (ssh -o option) by cmv
in thread Net::SSH::Perl ConnectTimeout (ssh -o option) by codejerk

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