The new MacBook Airs are two times faster than the last generation MacBook Airs. They are also faster than the high end 17" MacBook Pros from 2010. [1] They are about as fast as the low end 13" MacBook Pro.

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1. http://electricpig.co.uk/2011/07/20/2011-macbook-air-benchma...

2. http://www.primatelabs.ca/geekbench/mac-benchmarks/