Fedora Core 5 Webbrower is slow ( I think it's DNS lookup)

When i try to use a webrowser it is extremely slow in FC5x64 using Firefox and gnome.
I have already disabled ip6 here's what happens when i type ifconfig:

eth0      Link encap:Ethernet  HWaddr 00:03:25:35:1B:AE
          inet addr:192.168.1.100  Bcast:192.168.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:230 errors:0 dropped:0 overruns:0 frame:0
          TX packets:200 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:230456 (225.0 KiB)  TX bytes:65271 (63.7 KiB)
          Interrupt:20

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:1312 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1312 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2095146 (1.9 MiB)  TX bytes:2095146 (1.9 MiB)

i've already added alias net-pf-10 off

to my /etc/modprobe.conf:

alias eth0 sky2
alias snd-card-0 snd-atiixp
options snd-card-0 index=0
options snd-atiixp index=0
remove snd-atiixp { /usr/sbin/alsactl store 0 >/dev/null 2>&1 || : ; }; /sbin/modprobe -r --ignore-remove snd-atiixp
alias net-pf-10 off

Here is my resolve.conf:

search accesscomm.ca          
nameserver 142.165.21.5
nameserver 142.165.200.5
nameserver 204.83.142.2

If you know how to fix my slow internet problem please let me know thx.