disable dnsserver - what is the cost?

When I disable DNS support (i.e. don't let squid run dnsserver), I get a
warning that performance could be very poor. Could someone explain, in
layman's terms, exactly how performance could be poor?

My version of squid (1.1.5b for OS/2) won't work if I enable dnsserver.
It seems to work fine without it, though.

--
Timur "too sexy for my code" Tabi, timur@tabi.org, http://www.tabi.org
... In Windows 95, no one can hear you scream