Hi, I am a recreational user of FCPX. It turns great on my imac but way too slow on my 2010 MBA 11" ultimate. Will the 13" 2013 ultimate run it smoothly? Im concerned about lags while trimming, inserting clips, etc. Or will the 2013 13" rMBP be better? Im less concerned about the seemingly incrementally better iGPU and more concerned that it could accommodate more than 8GB of RAM and has better thermal performance. Thanks!