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Performance in Photoshop CS4 vs CS3
CS4 is clearly faster on large files
Photoshop CS4 is a worthwhile upgrade for anyone working with large files.
This fact alone will make the upgrade price worth it to anyone working with large files. Remember, a 3.2GHz Mac Pro is only 14% faster than a 2.8GHz model, and that’s best-case and with a huge price premium.
CS3 and BiggerTiles, DisableScratchCompress plugins
The Configuration page discusses how important it is to use the and plugins with Photoshop CS4.
With Photoshop CS3 it’s even more critical. Compare these times for(32GB, 4-drive striped RAID):
CS4 with/without plugins: 71 / 101 seconds = +42% longer
CS3 with/without plugins: 83 / 183 seconds = +120% longer
These results were so startling that the tests were run a second time.