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64-bit and GPU-accelerated performance
With a venerable program like Illustrator that already has a significant range of features, adding new tools isn't always the most important thing. In Illustrator CS6, Adobe has concentrated on improving performance with a 64-bit version of the application (important for dealing with large files that can have thousands of objects and layers). Even on older systems, the Mercury performance engine should speed up complex files, especially when you preview effects. This image has a large number of objects — the hair alone is made up of ten layers. Changing colour fills and blurring the effects isn't real time on an older PC like a first-generation Core i5, but it's fast enough for you to experiment until you get the effect you want.
Screenshots: Mary Branscombe/ZDNet UK