Does the lack of 64-bit support mean Mac users won see any performance gains in Photoshop CS4 Extended?
Adobe is always working to enhance product performance, and 64-bit support is only one way to get there. Investments in a variety of foundational improvements —for example, greater use of graphics processors — will improve Photoshop Extended performance for all users. A number of workflow improvements will also help boost your day-to-day productivity.