Hi Sam,
The app tries a DNS lookup for "user-pc". The domain gets appended from /etc/resolv.conf
dhclient does update /etc/resolv.conf from dhcp, but it's been doing that for quite a while. That hasn't changed, and your real issue is the slow DNS response.
Doing an strace should tell you which DNS server gets queried, but it's probably your router acting as a DNS forwarder; and the real issue becomes why your router takes several seconds to return a DNS response.
Actually, for looking up my own hostname no DNS query should be needed at all. I've just checked - even in case it really is a configuration issue within the network - Windows7 just copes fine with it
So I wonder, shouldn't the DNS code in glibc simply detect the lookup in this case is localhost (as Windows DNS implementation does obiously)?
Regards, Clemens