This will disable IPV6
Temporary: (use this first to see if there is a difference)
As root do:
echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6
open /etc/sysctl.conf as root
add these two lines to the bottom:
#disable ipv6save the file
type "about:config" into the webbrowser
if a screen pops up shouse to contine
search for ipv6
double click "network.dns.disableIPV6" to set its value to true
this change takes affect immediatly
This works because almost no internet provider uses IPV6 yet.
Without this your system will first try IPV6 and then after a timeout try IPV4 thus slowing things down.
IMPORTANT!! available ipv4 addresses are running out fast and are expected to run out in 2011, so you may want to avoid deploying this in a large computer network.