[CentOS] POOR: results using 'dig +short porttest.dns-oarc.net TXT'

What are the likely cockpit errors involved when getting POOR results
when running this test on an updated CentOS 5.2?

Kind regards/ldv

[root at shell ~]# dig +short porttest.dns-oarc.net TXT
z.y.x.w.v.u.t.s.r.q.p.o.n.m.l.k.j.i.h.g.f.e.d.c.b.a.pt.dns-oarc.net.
"a.b.c.d is POOR: 26 queries in 1.3 seconds from 1 ports with std dev 0.00"