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I sshed to a ssh server, every command I exec has a delay, a simple w then return, it will take 1 second to response, UseDNS no has been set, and server is idle.

I googled and tried some methods, but all failed.

What maybe the cause?

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UseDNS no only affects the initial establishment of the ssh connection, nothing more. What is your network latency to the server? What is the disk IO and CPU load like on the server? –  EEAA May 8 '13 at 2:15
    
Server is totally idle, and network either –  nfpyfzyf May 8 '13 at 2:33
    
what ssh client are you using to connect? what options? –  tristan May 8 '13 at 2:45
    
MacOSX 10.7.5's native ssh command, OpenSSH_5.6p1, OpenSSL 0.9.8r 8 Feb 2011, no options, directly ssh user@host –  nfpyfzyf May 8 '13 at 3:03

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