Hey guys , My girlfriend is attending grad school this coming fall and is looking to replace her MBP. She is a tab hoarder and has literally 50-60 tabs open on two separate windows. This has led to severely bogging down the computer, where even a new tab creates a beachball loading animation. Anyways. She's looking to replace it with either a MBA or rMBP. I have not kept up to date with how processors have evolved over the years. Her i5 is 2.3ghz while the base MBA is 1.4? Granted I bet it performs better and more efficiently but is it a radical upgrade over her current processor? Thanks for any suggestions and comments !