browsing web became very slow after IPtables firewall

I installed Redhat Enterprise version 3.0 on a Dell PC. After I configured
the firewall through IPTables, browsing Internet in Mozilla became very
slow. It took 15 seconds or more to show the first page of www.msnbc.com. My
computer is directly connected to the Internet and I only use the filter
table in the firewall. Any ideas about what is wrong?

This is what I have in the /etc/sysconfig/iptables
=================================
*filter
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -i lo -j ACCEPT
-A INPUT -i eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT
#-A INPUT -i eth0 -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
COMMIT


Thanks,

Philip