> Drop a file inside /etc/modprobe.d with the line
> install ipv6 /bin/true
> Then check. This disables IPv6.

How can one be sure that it is an issue with IPv6? Also, will this hack not affect other applications/services?

>Still using FF 3.0, dude FF 3.5 is out, switch to it, it is awesome.
>It uses html 5 and some really cool features.

FF3.5 doesn't use HTML 5, it supports the standard. Yes it does render JS remarkably faster due to optimizations in the JS VM.