I've been following this conversation closely, since this is a really interesting and relevant topic for me as well. I paint in massive files with hundreds of layers for my work. The brushes I use are rarely that complex, but I still hit walls of lag sometimes on my powerful desktop PC and cintiq combo while painting (any brush that gets large enough or on complex enough files). So what is the easiest way to test where the bottleneck is happening and to track realtime how many cores or percentage of cores being utilized? I'd like to run tests while painting in photoshop and see just what is being used the most: RAM, scratchdisk, CPU, GPU.. etc. Isn't lag while drawing more complex than just raw CPU speed? I thought Adobe was a RAM hog and fast SSD scratch disk or fast RAM made a bigger boost than more cores? I guess faster 4 -6 core is better than a slower 12 core? I'm really curious to see where my system is most "lacking" according to the restraints of photoshop.