i second the DNS recheck.  most *nix services rely on doing reverse  
dns checks and if reverse dns isn't configured correctly, the service  
has to wait for a timeout which can make your service very sluggish.

Quoting Jay Kline <slushpupie at gmail.com>:

> Jon Schewe wrote:
>> Has anyone setup a kerberos server on Linux?
>>
>> Any ideas as to why this is so slow?
>>
> Does a klist or kpasswd take long? If those are quick, then I imagine
> its something on your apache server. If klist and kpasswd take a while,
> then I would check your DNS setup.  Does it take much time to look stuff
> up?
>
> Jay
>
>
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