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I just ran Futuremark Peacekeeper to compare the latest browsers on my MacbookPro 4,1 (Snow Leopard 10.6.2) and here are the results:
Safari 4.0.4 (Build r52531) - 4331
Chrome 4.0.282.0 (Build 35277) - 3390
Opera 10.50 (Pre Alpha) - 2350
Minefield 3.7a1pre (Gecko/20091225)- 2274
Firefox 3.5.6 - 1499
Interesting results methinks!
Opera for Mac isn't as optimized yet. But those results you've got there sure don't agree with all the other tests showing Safari lagging behind both Chrome and Opera.