I have a windows 7 machine with a i7 860 cpu and 12 Gb of ram. Harddrives are in Raid 0 but it's not the speed of an SSD. As hobby I mainly do some photo- and videoediting with Lightroom 4 or photshop elements 11 and I also use premiere elements 11. Probable next week, I will buy a macbook retina but have no experience with the Mac OS in terms of speed and performance. . According the geeckbech browser, the 3 years old i7 in my windows machine scores arround 7500 and the i5 2500 in a 13 inch rMBP arround 6000. Is this a hugh difference? On my windows machine, the applications I 've mentioned are running fine and fast enough. Would that also be on the 13 inch rMBP or should I really take a look at the faster (and more expensive) 15 inch? Does anyone has experience with such a change from Windows 7 to mac with these hardware?