I'm just about to upgrade my i7 2.6ghz 2010 MPB with separate graphics card to the 2015 2.2 ghz integrated.. I couldn't afford higher spec & thought the newer model would still be a big improvement but am now starting to worry that I will miss that extra power. I mainly do intensive Raw editing in lightroom.. Is it ok that I didn't swap like for like & will that still be a good upgrade or should I have held out? Does that extra spec make much difference or is it more important to have a newer machine? I know it may sound like a stupid question but I'm just suffering from buyers remorse & worried I've spent out a lot of money on the wrong set up & should have perhaps got an older but more powerful model! Any thoughts greatly appreciated. many thanks!