Speed Up Firefox DNS Lookup

1. Close IPV6 support

# echo "alias net-pf-10 off" >> /etc/modprobe.conf
# echo "alias ipv6 off" >> /etc/modprobe.conf

Type “about:config” into the address line and enter.
Set “network.dns.disableIPv6″ to “true”

2. Some other tweaks

Type “about:config” into the address line and enter.

Set “network.http.pipelining” to “true”
Set “network.http.proxy.pipelining” to “true”
Set “network.http.pipelining.maxrequests” to some number like 25 depending on the network. 25 requests will be made at one time.

Right-click on the page and select New-> Integer.
Name it “nglayout.initialpaint.delay” and set its value to “0″. This value is the amount of time the browser waits before it acts on information it receives.

I test it on Fedora 11 and the firefox is much faster now.