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You do not need to upgrade yet! In your case this benchmark likely measured your download speed and not the rendering speed.
On my MacBookPro I get abount 8 seconds in Opera and Safari. If I open the HTML file from the hard drive it takes abount 0.3 seconds in Safari and about 2 seconds in Opera.
BTW the file has a size of 796 KB and my max. download speed is 1024kbit/s.