So the reason is that my known_hosts file has over 5k records.
I think that Paramiko is for looping for each host in known_hosts and 
/etc/hosts file. 
In my case it's around 800k checks. 

On Saturday, March 15, 2014 7:20:06 AM UTC-7, Michael DeHaan wrote:
>
> Paramiko's host file handling has been noted to be a performance problem 
> in some cases where host files get large.
>
> We haven't exactly tracked down *why*.
>
> (I really really wish RHEL/CentOS would update their OpenSSH... can't wait 
> for RHEL 7 -- and less and less folks will need paramiko)
>
>
>
>
>
>
> On Fri, Mar 14, 2014 at 9:37 PM, Adam Heath <[email protected]<javascript:>
> > wrote:
>
>> nscd turned off?  ldap in use?
>>
>>
>> On 03/14/2014 07:36 PM, Filip Slunecko wrote:
>>
>>> I deployed on different box (the same version) and it works just fine.
>>> Not sure what is the issue on the first one.
>>>
>>
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