I find my machine very slow even when browsing the web using Chrome. It's probably not the processor. What is the likely cause? Is it the memory (4GB)? Is it the SSD (about 18 GB free)? Is it Chrome? I was almost certain I'd upgrade to a newer machine, but I don't like rMBP as I had some issues with encryption on the disk and I'm hearing a number of screen problems not to mention lag. I was almost set on an MBA when I found the edges too sharp while playing with it in the store. Then I started thinking about the MB despite the lack of ports, but just saw an article saying it clocks in at 2011 MBA speeds which means it's probably close to my 2010 MBP! So would I even benefit from an upgrade, or should I just try and fix my existing machine...the only obvious thing being the SSD, but would that really make a difference to browsing speeds? Is the Geekbench score a CPU centric score or does it also account for memory speed and SSD speed?