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I updated my mid11 13" to OS X Sierra and haven't noticed any slow down, which is great I'm still getting about 56 hours out of a single charge using the original battery It's a lot less if I'm streaming However, I'm probably going to upgrade the 128 GB SSD to a Transcend 480 GB in the next few monthsFind many great new & used options and get the best deals for Macbook air 11 inch mid 11 at the best online prices at eBay!Introduced in July 11, the MacBook Air (13inch, Mid 11) was based on Intel's nextgeneration "Sandy Bridge" architecture, and improved on its predecessor, the MacBook Air (13inch, Late 10) with faster processors and graphics, a backlit keyboard, and the inclusion of Apple's new Thunderbolt port It shipped in two configurations Used Apple Macbook Air 13 Inch 1 7ghz Core I5 Mid 11 Mc965ll A Mac Of All Trades Macbook pro (13-inch early 2011) latest os