I currently use a late 2009 21" iMac (the most basic, cheapest one) with the ram upgraded to 12gb. I mainly use my computer for web browsing, emailing, sometimes handbrake, and Aperture (or maybe lightroom in the future). Photography is my hobby and I do not make a living off it. Entering its 7th year service, the computer is really showing its aging signs and even basic stuff it is getting a bit slow at times (did a fresh install in April). What annoys me the most now is that whenever I use Aperture, it is extremely slow especially when I move a slider, it feels it takes forever before the adjustment is shown in the picture. I mostly edit RAW pictures from my Canon 6D (~30mb each). Is the rMB powerful enough if my biggest concern is the slowness in Aperture? If it doesn't do I need to look for something that has a discreet graphics card?