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System requirements
Last updated 9/29/2014
To ensure optimal performance, only local drives are available as scratch disks.
2 Click OK.
3 To apply the changes, restart Photoshop.
Specify history and cache settings
In the Performance preferences, do any of the following:
Specify the maximum number of History States that appear in the History panel.
Specify the Cache Levels and Tile Size for image data. To quickly optimize these settings, click a preset for images
with these characterstics:Tall and ThinMany layers and small dimensions.DefaultModerate dimensions and
layers.Big and FlatLarge dimensions and few layers.
You must restart Photoshop to apply new cache settings.
Free memory
The Purge command lets you free memory used by the Undo command, the History panel, or the clipboard.
Choose Edit > Purge, and choose the item type or buffer you want to clear. If it is already empty, the item type or
buffer is dimmed.
Note: The Purge command permanently clears from memory the operation stored by the command or buffer; Purge
cannot be undone. For example, choosing Edit > Purge > Histories deletes all history states from the History panel. Use
the Purge command when the amount of information in memory is so large that Photoshop performance is noticeably
affected.
Enable OpenGL and optimize GPU settings
OpenGL is a software and hardware standard that accelerates video processing when working with large or complex
images such as 3D files. OpenGL requires a video adapter that supports the OpenGL standard. Your performance when
opening, moving, and editing 3D models is significantly improved on a system with OpenGL. (If OpenGL is not
available on your system, Photoshop uses software-based ray-trace rendering to display 3D files.)
If OpenGL is present on your system, you can enable it in the Preferences dialog box.
1 Do one of the following:
(Windows) Choose Edit > Preferences > Performance.
(Mac OS) Choose Photoshop > Preferences > Performance.
2 In the GPU Settings section, select Enable OpenGL Drawing.
3 Click OK. The preference affects subsequently opened images. No restart is necessary.
For more information, see:
GPU and OpenGL support | Photoshop CS4, CS5(kb404898)
GPU and OpenGL features and preferences | Photoshop and Bridge CS5, CS4(kb405745)
Tested video cards | Photoshop CS5 (cpsid_83117)
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