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Recently bought a 2013 Air with 8GB (i5) model.
Playing LoL on it and getting 30-40fps @ 1440x900 with everything on very low and low wasn't cool
especially when my 2009 MacBook Pro was getting 60fps with character detail on very high.
After I did an SMC reset on my Air, I get a consistent 60fps @ 1440x900 with everything on low now (which is fine with me for now)
so if you own an Air and hate the FPS you're getting, try the SMC reset. Worked great for me.