Hello Everyone,
On my system Firefox 4 seemed to be taking its sweet time “looking up” addresses, but when it found the page it blazed on the render.
I poked around on the net and found a few suggestions to speed up the “look up”. So I thought I would share… I aimed for the fewest changes, so not to break too many things or make a big mess… 
(Warning moving and changing things that you don’t know about, in the about:config can goof up Firefox so double check your settings)
place about:config in the address bar and hit enter
You should get a really long list of things
In the search bar put
‘network.dns.disableIPv6’
My default value was set to false, go ahead and set it to true. Right click and Toggle.
Clear out the search bar where ‘network.dns.disableIPv6’ was, and put in ‘network.http.pipelining’
You should have three listings
Right click on ‘network.http.pipelining’ and Toggle so “true” shows for the value.
Next, right click on ‘network.http.pipelining.maxrequests’ and Modify, a box will pop up, replace the default 4 with 8.
Close the about:config
Now test your Forefox performance. 
These three small changes, made a world of difference for me. Its now comparably fast as chromium.
If you disagree with what I did, or want to let me know of any other “safe” speedups let me know. lol!
PS. If you don’t see any improvements performance-wise or your from the future and do use IPv6, it would be best to go and take these settings back to the default Firefox settings.
