I have a desktop - mac pro - 2008 quad core, 8 gb of ram. (can't upgrade ram now). 2.8GHz Quad-Core, standard 500GB HD Another is a macbook pro - 2012 non-retina. the base version. 4gb of ram but can upgrade to 16gb. same standard 500 GB HD Shooting a Canon 5D mark 2 - about 20 mb RAW image size. Which would run Lightroom faster? LR used to be seamless on my desktop but as cameras have gotten better, and image files getting bigger, i find lags while switching between photos on my desktop. I wonder if this goes away with the laptop with more ram?