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The Photoshop CS5 Upgrade (Introduction)
Related: Lightroom, memory, optimization, Photoshop, software
This series on Photoshop CS5 will grow over time, but for starters we’ll focus on speed vs Photoshop CS4.
The 64-bit gain
The key difference between Photoshop CS4 and CS5 is that CS5 now uses Apple’s Cocoa framework for the user interface, allowing CS5 to be a full 64-bit application. This is what Adobe says caused it so much work and delay; rewriting the user interface from Carbon to Cocoa.
Of course, Photoshop CS5 has cool new features and capabilities, but for those working with large files, the 64-bit thing is key, because it means that working with large files can be much faster, because operations can be performed in memory.
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You can observe memory usage using Activity Monitor.
After running the diglloydMedium Benchmark, Photoshop CS5 is using 14.67GB of real memory, with 89 threads created (on an 8-core Mac Pro Nehalem). The “Intel (64 bit)” kind confirms it as 64-bit, though obviously it has to be to use 14+ GB of real memory.