[CentOS] firefox slow on 5.6

Mon Apr 11 00:44:29 UTC 2011
Jerry Geis <geisj at pagestation.com>

I have updated to 5.6 - GREAT job guys...

when I do "host slashdot.org" for example it comes back immediately.
when I enter slashdot.org on firefox it says "Looking up slashdot.org" 
for a LONG time like 15 or 20 seconds
before continuing.

I have set network.dns.disableIPv6 true.

Any idea why firefox is so slow?