i have my old 2011 13" air with core i5 1.7ghz, 4gb ram and 256GB FS. and recently i bought the 2012 11" air with spec as 2.0ghz core i7, 8gb of ram and 128GB FS. i tried putting the same big jpeg picture on adobe illustrator and export them at the same time to 300dpi PNG file, 450mmx450mm in size. i found that my old 2011 is faster by 10 seconds to complete the processes. my old 2011 air is using mountain lion DP4, and my new 2012 air is still using osx lion. is mountain lion that much faster? or my 2012 air is a dud?