Anything that runs under Vista is slow....
I have Win 7 running on an ATOM processor 10” Acer Notebook and FF 4is great...only drawback is that Fbook seems to hang once in a while. I used the Beta for several weeks and finally uninstalled V3.
my primary computer (which I use for graphic/video work) is an iMac & I love Firefox on it. Safari is their “choice”.
My notebook is a HP & I really like it but due to virus etc concerns dont get too adventurous on it. When I travel I go to FAcebook, email, weather, FR & another site only. Dont click “cutsie links”
MY nephew does web site development for Firefox. (go to the website.. if you dont like it, it is Jason’s fault)
He lives in Portland(yes sorry lib kid) and works from home in his jammies even though base is San Fran.