Hi, first time poster here. Thinking of purchasing a new Macbook - it would probably be the 1.3GHz processor with 256GB SSD. I love the retina screen and the Force trackpad - I can just about handle the keyboard, which at times I find genius and at other times, downright annoying!! I played with a 1.1 GHz version today in the Apple Store near me and it lagged a few times when there were a few programmes open, but my usage will probably be more "one program at a time" as that's the way I learned to minimise system stress back in the days of x86 devices! So if I have 4 apps open at once, that would be all and apart from a little fiddling occasionally with Logic Pro X or Garage Band, which I would only use if it were the only app open, I am unlikely to stress the processor too much. Am I likely in your opinion to find much lag in this way of usage? The shop one seemed very responsive working with only one open app at a time, but didn't like it when I opened a few up - the processor graph was topping out quite a lot. Would be interested in your thoughts - and whether the 1.3 processor would be that much better at alleviating any bottlenecks. My alternative is a maxed out Core i7 11" Air, where I lose some screen quality (though it is not as bad as I had thought it might be!) and force trackpad, but get an arguably more usable keyboard, together with ports, magsafe and processor power! (and it's £140 cheaper!) Thanks in advance for your time in posting.