Optimize performance in Photoshop CS4 on Mac OS
To check memory use in Photoshop, open the Efficiency Indicator: Choose Efficiency from the pop-up menu on the status bar of your image to display the percentage of time actually doing an operation instead of reading or writing the scratch disk. If the value is below 95-100%, Photoshop is using the scratch disk and, therefore, is operating more slowly. If the efficiency is less than 90%, you'll see a large performance increase by changing your RAM allocation or adding RAM.
via kb2.adobe.com
Had no clue that Photoshop had this. The whole document is quite good and should be bookmarked by anyone who spends time in Photoshop
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