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Last updated 11/30/2015
Memory and performance
Allocate RAM to Photoshop
Photoshop displays the RAM available to Photoshop and the ideal range of RAM for Photoshop (a percentage of the
total available RAM) in Performance preferences.
?
In the Performance preferences, enter the amount of RAM you want to allocate to Photoshop in the Let Photoshop
Use text box. Alternatively, drag the slider.
For detailed information on improving Photoshop performance, including specifying RAM settings in preferences, see
Optimize performance | Photoshop CS4, CS5 (kb404439) in the Adobe support knowledgebase.
Assigning scratch disks
When your system does not have enough RAM to perform an operation, Photoshop uses a proprietary virtual memory
technology, also called scratch disks. A scratch disk is any drive or drive partition with free memory. By default,
Photoshop uses the hard drive on which the operating system is installed as the primary scratch disk.
Photoshop detects and displays all available internal disks in the Preferences panel. Using the Preferences panel, you
can enable other scratch disks to be used when the primary disk is full. Your primary scratch disk should be your fastest
hard disk; make sure it has plenty of defragmented space available.
The following guidelines can help you assign scratch disks:
For best performance, scratch disks should be on a different drive than any large files you are editing.
Scratch disks should be on a different drive than the one your operating system uses for virtual memory.
RAID disks/disk arrays are good choices for dedicated scratch disk volumes.
Drives with scratch disks should be defragmented regularly.
Change the scratch disk assignment
1 Do any of the following in the Scratch Disks area of Performance preferences:
To change the scratch disk order, click the arrow buttons.
To enable or disable a scratch disk, select or deselect the Active checkbox.
To ensure optimal performance, only local drives are available as scratch disks.
2 Click OK.
3 To apply the changes, restart Photoshop.
If Photoshop cannot launch because the scratch disk is full, hold down the Cmd + Opt keys (Mac) or Ctrl + Alt keys
(Windows) on launch to set a new scratch disk.
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.
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