Hi, I'm currently working with a 2009, MacPro (4,1), 2.93Gz x 8 cores, 16Gb ram, and an AMD 4870 (512Mb) attached to 30" Apple Cinema Display. Whenever I use Illustrator CS6, the redraw times, and moving around vector are dismally slow. On a less than complex file, picking up and moving around a vector is sluggish. I don't think it's Illustrator, as the same issue existed with CS5. I've gone so far as to install the exact same fonts, and use the same file, on my 2010 2.2Ghz MacBook Pro with 4Gb ram, and my kids 4.3GHz, 8GB ram PC. On both machines, I was able to move around the vectors smoothly. I then decided to try out some other files, and each case, they were jittery on my MacPro compared to the other two test machines. Thinking it might have been a Hard Drive issue, I've reinstalled the OS, 10.6.8 three times. I've tried 2 separate 7800rpm drives and an Intel SSD - none of the of drives made any significant gains in performance. I started removing Ram from the banks, one by one, and thought I noticed an improvement when using only 4Gb, but I was so tired by that point, it could have very easily been my imagination. It should be noted, my ram banks are populated with 8 x 2Gb ram sticks. I asked my Apple Tech if he thought 2 x 8Gb sticks would make a difference and didn't think it would. I'm at my wits end. I just don't know what to do. There's obviously an issue, when my crappy MacBook Pro with 4Gb of ram is redrawing in Illustrator faster than my Mac Pro. It's possible it's the logic board, or maybe the machine is just getting old. Has anyone else had similar issues with this model? Can anyone offer additional advice on how I might make Illustrator more "snappy"? It becomes sooo slow at times, I can barely move vectors across my screen. Thanks in advance!