The iMac I just bought is slow for internet browsing

Hi all,
The iMac (21,5p, 2.5Ghz intel core i5 / 4Gb / Lion 10.7.2), I just bought on the Apple Store is very slow for web browsing (maybe less by using firefox instead of safari but slow even with firefox). It seems to be a latency issue and not a download or upload issue. My iPhone 3GS is working better for web browsing on the same network (home network with a Wifi access point)
I have a powerful cable connection (15ms ping, 60Mb/s download, 5Mb/s upload) that I tested with speedtest web site.
It's quite strange because firefox works fine within a Windows virtual machine hosted on the same iMac !!!
I also tested my internet connection by using Unison (binnews) and it works very well with a very good download rate.
I used before a macbook with Snow and it was very good for internet browsing. I really do not understand what append with this iMac.
I'm very confused.
FYI: my iMac is connected to a netgear switch. The switch is connected to a Cisco router and at the end there is the Cablebox in bridge mode.
I'm using OpenDNS service for IP resolution. I tested DNS service of my internet provider a got the same result (poor latency when I'm browsing from a site to another).
I'd appreciate any advice to help me having a good experience for internet browsing with my new beautiful iMac.
Many Thanks,
David

https://support.apple.com/kb/TS3802
and openDNS/googleDNS isn't always faster when it comes to Akami distributed content like what Apple uses
http://apcmag.com/why-using-google-dns-opendns-is-a-bad-idea.htm
test fastest DNS with this
(doesn't work for Akami content as the closest server is better, meaning your ISP im most cases)
https://code.google.com/p/namebench/
http://hackiteasy.blogspot.com/2008/05/make-mozilla-firefox-10x-faster.html

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