What's covered

• Optimize your hardware setup
• Set Performance preferences
• Best practices for working in Photoshop
• Optimize the OS for Photoshop

There are four primary ways to affect performance in Photoshop:

• optimize your hardware setup
• specify Performance preferences
• use good work habits in Photoshop
• take certain steps to speed your OS

For best results, however, take a holistic approach to optimizing Photoshop performance. Read all of the suggestions here. Consider which ones to implement within the context of your computer setup, the types of files you use, and your particular workflow. Each circumstance is unique and requires a different combination of techniques to get the most efficient performance from Photoshop.

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Optimize your hardware setup

• Use a fast enough processor
• Max out on RAM
• Use a fast, large hard disk
• Solid-state disks

Use a fast enough processor

The speed of the computer’s central processing unit, or CPU limits the processing speed of Photoshop. Photoshop CS4 requires a PowerPC G5 or multicore Intel processor (Mac OS) or a 1.8 GHz or faster processor (Windows). Photoshop CS5 requires a multicore Intel processor (Mac OS) or a 2 GHz or faster processor (Windows).

All Photoshop features are faster on a multiprocessor system, although some features take greater advantage of the additional processing power than others. There is a law of diminishing returns with multiple processors: The more processors you use, the less you get from each additional processor. Therefore, Photoshop isn't necessarily four times as fast if you have four microprocessors. 

Max out on RAM

Photoshop uses random access memory (RAM) to process images. If Photoshop has insufficient memory, it uses hard-disk space, also known as a scratch disk, to process information. Accessing information in memory is faster than accessing information on a hard disk. Therefore, Photoshop is fastest when it can process all or most image information in RAM. If possible, allocate enough RAM to Photoshop to accommodate your largest image file.

How much RAM can Photoshop access?

* 64-bit Photoshop is not officially supported on 64-bit Windows XP, but it should run.

For more information on performance and 64-bit Photoshop, see 64-bit operating system benefits and limitations | Photoshop CS4, CS5.

For instructions on allocating RAM to Photoshop, see Memory Usage.

Use a fast, large hard disk

Photoshop reads and writes image information while working on an image. Therefore, the faster the scratch disk or the disk that contains the image, the faster Photoshop can process image information. To improve Photoshop performance, use a disk with a fast data transfer rate, such as an internal hard disk. Network servers (hard disk accessed over a network) or removable media has slower data transfer rates. Removable media are also more easily damaged than non-removable disks.

Photoshop CS4 and CS5 require at least 1 GB of free hard-disk space (Windows) or 2 GB of free hard-disk space (Mac OS). Additional free space is required for installation, and more hard disk space is recommended for virtual memory and scratch disk space.

Fast RAID 0 arrays make excellent scratch disks, especially if the array is used exclusively for your scratch disk. Also make sure that the array is defragmented regularly, and isn't your startup volume. 

Solid-state disks

Installing Photoshop on a solid-state disk (SSD) allows Photoshop to launch fast, probably in less than a second. But that speedier startup is the only time savings you experience, because that’s the only time when much data is read from the SSD.

To gain the greatest benefit from an SSD, use it as the scratch disk. Using it as a scratch disk gives you significant performance improvements if you have images that don’t fit entirely in RAM. For example, swapping tiles between RAM and an SSD is much faster than swapping between RAM and a hard disk.

If your SSD doesn’t have much free space (if the scratch file grows bigger than can fit on the SSD), you can add a secondary or tertiary hard disk (after the SSD).

Also, SSDs vary widely in performance, much more so than hard disks. Using an earlier, slower drive results in little improvement over a hard disk.

Note: Adding RAM to improve performance is more cost effective than purchasing an SSD. If money is no object, you're maxed out on installed RAM for your computer, you run Photoshop CS5 as a 64-bit application, and you still want to improve performance, then consider using a solid-state disk as your scratch disk.

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Set Performance preferences

The Performance preferences you specify greatly affect Photoshop performance. To set Performance preferences, choose Photoshop > Preferences > Performance (Mac OS) or Edit > Preferences > Performance (Windows). Then, specify options in each of the following areas:

• Memory Usage
• Scratch Disks
• History & Cache preferences
• GPU Settings

Memory Usage

The more RAM available to Photoshop, the faster Photoshop can process image information. The Memory Usage area of the Performance preferences dialog box tells you how much RAM is available to Photoshop. It also shows you an ideal range for your system.

Note: Available RAM is not your total RAM. Photoshop subtracts RAM needed for the operating system. 

By default, Photoshop uses 70% of available RAM. You can assign more or less RAM to Photoshop by changing the value in the Let Photoshop Use box, or by dragging the Memory Usage slider. Restart Photoshop for changes to take effect.

The default RAM allocation of 70% is fine for most people running the 32-bit version of Photoshop. To find the ideal RAM allocation for your system, change it in 5% increments and monitor performance in the Efficiency status indicator. See Keep an eye on the Efficiency indicator.

If you run the 64-bit version of Photoshop and you experience out-of-RAM or out-of-memory errors, increase your RAM allocation. With no other applications running at the same time, you can increase the RAM allocation to 100% to improve Photoshop performance.

If you run the 32-bit version of Photoshop, you can experience out-of-RAM errors if you set the RAM allocation to 100%. If you get out-of-RAM errors, reduce the RAM allocation to 85% to 90% and retest. If problems continue, reduce the RAM allocation in 5% increments. Retest until the error stops occurring, or use the 64-bit version of Photoshop if you can.

Scratch disks

Set the scratch disk to a defragmented hard disk that has plenty of unused space and fast read/write speeds (see Defragment the hard disk). If you have more than one hard drive, you can specify additional scratch disks. Photoshop supports up to 64 exabytes of scratch disk space on up to four volumes. (An exabyte equals 1 billion GB.)

Adobe recommends that the primary scratch disk is a different hard disk from the one that the OS uses as a startup drive. See Assigning scratch disks in Photoshop CS5 Help for more information.

History & Cache preferences

Cache Levels

Photoshop uses image caching to speed the redraw of high-resolution images. With caching, Photoshop uses low-resolution versions of images to quickly update the image onscreen as you work. The Cache Levels option allows you to tell Photoshop to save 1 through 8 levels of cached image data. The more cache levels you have, the slower Photoshop opens the file, but the more responsive it is while you work. The fewer cache levels you have, the faster the image loads, but slower Photoshop performs. 

The default Cache Levels setting is 4. However, you can change that depending on the types of files you work with and how much RAM you have on your computer.

If you use relatively small files—roughly 1 megapixel or 1280 by 1024 pixels—and many (50+) layers, set the cache to 1 or 2. Setting Cache Levels to 1 disables image caching; only the current screen image is cached.

Note: Some features in Photoshop don't produce the highest-quality result if Cache Levels is 1.

If you use larger files—say, ten megapixels or larger—set Cache Levels higher than 4. Setting a higher cache level improves performance by speeding redraw times.

The cache tile size is the amount of data (tiles) that Photoshop operates on at one time. Photoshop processes each tile of data, then redraws it. Photoshop is more efficient when it operates on larger tiles, but larger tile sizes take longer to redraw. Bigger tiles make complex operations such as sharpening filters go faster, but smaller changes such as brush strokes are more responsive when Photoshop uses smaller tiles. 

In Photoshop CS4, you can change the cache tile size using the Bigger Tiles optional plug-in (see Bigger Tiles plug-in (Photoshop CS4).

In Photoshop CS5, you can choose a tile size from the Cache Tile Size pop-up menu in Performance preferences. If you have a processor newer than a Pentium 4, choose 128 K or 1024 K (smaller tiles). If your processor is a Pentium 4 or AMD, Photoshop is more efficient using 132 K or 1032 K (bigger tiles).

In Photoshop CS5, the History & Cache section of the Performance preferences also has three cache presets: Tall And Thin, Default, and Big And Flat. These options set your cache level and tile size based on the kind of document you’re editing and the amount of RAM you have installed on your computer.

• Tall And Thin Optimal for editing smaller images that have many layers and you have less RAM.
• Big And Flat Good for large images (hundreds of megapixels) with fewer layers and you have lots of RAM.
• Default For images in between.

History States

Each history state, or snapshot, of an operation that affects the entire image increases the amount of scratch disk space that the file needs. Photoshop creates a copy of the original. So, for example, if you apply a Gaussian blur to a 500-KB image and create a snapshot of that edit in the History panel, Photoshop requires 1 MB of scratch disk space for the image. If you apply a Levels adjustment, a Noise filter, and an unsharp mask to a 5-MB image and save a History snapshot of each state, the image needs 15 MB of scratch disk space.

(If you create a history state of operations that affect only part of the image, such as paint strokes, only the tiles affected by the strokes are added to the image size.)

You can save scratch disk space and improve performance by limiting or reducing the number of states that Photoshop can save in the History panel. Photoshop can save up to 1,000 history states; by default, it allows you to save 20. To reduce that number, click the History States pop-up menu in the History & Cache area of the Performance preferences dialog box, and drag to a lower value.

Bigger Tiles plug-in (Photoshop CS4)

The Bigger Tiles plug-in, which is located in the Optional Plug-ins folder on the application DVD, is disabled by default. To enable it, copy it to the Extensions folder in your Photoshop CS4 Plug-ins folder and remove the tilde (~) from the filename. Only enable the plug-in if you have more than 1 GB of RAM installed.

When you enable the plug-in, it increases the image tile size in Photoshop. Photoshop redraws more data at a time because each tile is larger, and each tile is drawn, complete, at one time. It takes less time to redraw fewer tiles that are larger than it takes to redraw more tiles that are smaller. Bigger tiles sometimes seem to redraw more slowly — and in fact it can take longer to see the results onscreen if you’re making repeated small adjustments. However, the total time it takes to compute and draw the final image is less. Screen updates while painting can be less smooth with Bigger Tiles installed.

If you spend most of your time painting or rapidly tweaking controls in filters or panels and Photoshop redraw is responsive, then don’t enable Bigger Tiles. But if you spend your time watching progress bars crawl across the screen, enable Bigger Tiles to improve performance.

GPU Settings

Photoshop CS4 and CS5 leverage the GPU on your computer’s video adapter to speed screen redraw operations. For Photoshop to access the GPU, the video adapter must have a GPU that supports OpenGL. It also requires at least 128 MB of RAM, and a driver that supports OpenGL 2.0 and Shader Model 3.0.

The best way to optimize GPU acceleration is to make sure that you keep your video adapter driver up to date. For more information about GPU acceleration and instructions on updating video adapter drivers, see GPU and Open GL support | Photoshop CS4, CS5. For instructions on specifying GPU Settings in the Performance preferences dialog box, see GPU and Open GL features and preferences | Photoshop and Bridge | CS4, CS5 (kb405745).

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Best practices for working in Photoshop

• Work within file-size limitations
• Keep an eye on the Efficiency indicator
• Close unnecessary document windows 
• Reduce patterns and brush tips in presets
• Minimize or turn off panel preview thumbnails
• Increase RAM when running memory-intensive features
• Set Maximize PSD And PSB File Compatibility to Ask
• Work in 8-bit image mode
• Turn off WYSIWYG font preview
• Reduce image resolution
• Purge Undo, the Clipboard, and History states
• Use the Filter Gallery
• Drag between files
• Edit individual channels
• Use layers wisely
• Save TIFF files without layers
• Don’t export the Clipboard

Work within file-size limitations

The larger the file you’re working with the more likely it is that you encounter performance problems. 

Photoshop CS4 and CS5 support a maximum file size of 300,000 x 300,000 pixels, except for PDF files, which are limited to 30,000 x 30,000 pixels and 200 x 200 inches.

File size capability for Photoshop CS4 and CS5:

• PSD files: 2 GB
• TIFF files: 4 GB

Note: Most applications cannot work with TIFF files larger than 2 GB.

• PSB files: 4 exabytes (4096 petabytes or 4 million terabytes)
• PDF files: 10 GB (pages are limited to a maximum size of 200 inches)

See also File size in Photoshop CS5 Help.

Keep an eye on the Efficiency indicator

Watch the Efficiency indicator while you work in Photoshop to determine when Photoshop maxes out on RAM and starts using the scratch disk, which slows performance. Click the pop-up menu at the bottom of the image window and choose Efficiency. (You can also view the Efficiency status in the Info panel. See Work with the Info panel in Photoshop CS5 Help.) If the Efficiency value is below 100%, Photoshop is using the scratch disk and, therefore, is operating more slowly. If the efficiency is less than 90% to 95%, allocate more RAM to Photoshop in Performance preferences (see Memory Usage) or add additional RAM to your system.

Close unnecessary document windows

Document windows use more RAM in Photoshop CS4 and CS5 than in previous versions. Too many open images in Photoshop can result in an “out of RAM” error message or cause Photoshop to run slowly. If this error occurs, close some document windows.

On Mac OS, using the Application frame is also RAM intensive. The Application frame groups all the workspace elements in a single, integrated window that lets you treat the application as a single unit. When you move or resize the Application frame or any of its elements, all the elements within it respond to each other so none overlap. Turn off Application frame by choosing Window > Application Frame.

Reduce patterns and brush tips in presets

To reduce your scratch disk overhead, minimize the number of patterns and brush tips you use in your presets. Also reduce the number of patterns you use in the Bevel And Emboss Texture and Pattern Overlay layer styles. Each small pattern and sampled brush in the presets uses at least one tile for storage. Patterns used in layer styles use extra RAM, as well.

To view Photoshop default patterns, choose Edit > Preset Manager and then choose Preset Type > Patterns.

Minimize or turn off panel preview thumbnails

Photoshop uses memory to display preview thumbnails in the Channels, Layers, and Paths panels. The more preview thumbnails Photoshop displays and the larger the thumbnail, the more memory Photoshop requires to draw and update the preview.

To minimize or disable thumbnail previews in these panels, click the Channels, Layers, or Paths panel options menu and choose Panel Options. In the Thumbnail Size area, select a smaller thumbnail size or choose None, and then click OK.

Increase RAM when running memory-intensive features

When you use content-aware scaling, perform 3D operations, or use the Liquify or Distort filters, Photoshop can respond slowly, not at all. Or, it can return an “out of memory” or “out of RAM” error. These features require more than the recommended minimum amount of RAM and scratch disk space for Photoshop.

If Photoshop responds slowly or returns an out-of-memory error when you use these features, increase the memory used by Photoshop. Or free up additional space on the scratch disk. For instructions, see Memory Usage and Scratch Disks.

If you use the 64-bit version of Photoshop CS5 and no other applications are running at the same time, try moving the Memory Usage slider in Performance preferences to 100%.

Set Maximize PSD And PSB File Compatibility to Ask

The Maximize PSD And PSB File Compatibility feature attaches a flattened copy of the image when you save it. This extra data ensures that PSD and PSB files can be opened in previous versions of Photoshop, in Photoshop Lightroom, and in non-Adobe applications that support PSD files. However, maximizing compatibility increases file sizes and therefore scratch disk space requirements. To make sure that you don’t unnecessarily increase file sizes with this option, do the following: 

1. Choose Photoshop > Preferences > File Handling (Mac OS) or Edit > Preferences  > File Handling (Windows).
2. Choose Maximize PSD And PSB File Compatibility > Ask or choose Maximize PSD And PSB File Compatibility > Never.

See Maximize compatibility when saving files in Photoshop CS5 Help for more information.

Work in 8-bit image mode

Photoshop can perform a number of features and operations on 16-bit and 32-bit images. However, if your resources are low, reducing your images to 8 bits per channel can improve performance. Choose Image > Mode > 8 Bits/Channel. See Bit Depth in Photoshop CS5 Help for more info.

Note: Converting to 8 bpc deletes data from your image. Save a copy of the original 16-bit or 32-bit image before you convert to 8 bpc.

Turn off WYSIWYG font preview

Turning off the WYSIWYG font preview list speeds the processing of fonts in Photoshop. Choose Photoshop > Preferences > Type (Mac OS) or Edit > Preferences > Type (Windows). Deselect Font Preview Size and click OK.

See Troubleshoot fonts | Photoshop CS5 for more assistance with fonts.

Reduce image resolution

The greater the resolution, the more memory and disk space Photoshop requires to display, process, and print an image. Higher image resolution does not necessarily correlate to higher image quality, but it can mean slower performance in Photoshop, and slower printing. The optimal resolution for your images depends on the type of printer you use. Make sure that image resolution is high enough for your printer to produce good output, without any excess data that your printer can’t use but must process.

To reduce the resolution of an image in Photoshop, choose Image > Image Size. In the Image Size dialog box, decrease the Resolution value, and then click OK.

For more information, see Advanced cropping, resizing, and resampling | Photoshop.

Purge Undo, the Clipboard, and History states

Undo, the Clipboard, and History states all hold image data. To free up RAM, choose Edit > Purge and then Undo, Clipboard, Histories, or All. 

Note: The Purge command cannot be undone.

Use the Filter Gallery

The Filter Gallery allows you to test one or more filters on an image before applying the effects, which can save considerable time. See Filter Gallery overview in Photoshop CS5 Help for more information.

Drag between files

Dragging layers or files is more efficient than copying and pasting them. Dragging bypasses the Clipboard and transfers data directly. Copying and pasting can potentially involve more data transfer and is much less efficient.

Edit individual channels

Photoshop requires less memory to apply a filter to a single channel than it does to apply a filter to multiple channels or to an entire image (composite channel). In a flattened image, each RGB channel is about one-third the size of the file; each CMYK channel is about one-fourth the size. To edit a single channel, select it in the Channels panel.

Use layers wisely

Layers are fundamental to working in Photoshop, but they increase file size and redraw time. Photoshop recomposes each layer after each change in the image. After you have completed changes to layers, flatten (merge) them to reduce the size of a file. Select the layers in the Layers panel, right-click (Windows) or Control-click (Mac OS) and choose Merge Layers. (Make sure to remove empty layers from the file since they bloat its file size. Select the empty layers in the Layers panel, right-click [Windows] or Control-click [Mac OS] and choose Delete Layer.) To flatten all layers in a file, choose Layer > Flatten Image.

Note: Photoshop does not let you separate layers after merging them. You can either choose Edit > Undo or use the History panel to return to an unmerged state.

If you don't frequently change some of your layers, consider converting layers or layer sets into Smart Objects, which saves disk space and improves performance. Select the layers or layer sets in the Layers panel, right-click (Windows) or Control-click (Mac OS) and choose Convert To Smart Object.

Save TIFF files without layers

Photoshop can save layers in TIFF files. However, layered TIFF files are larger than flat TIFF files and require more resources for processing and printing. If you work with a layered TIFF file, save the original layered file as an Adobe Photoshop (.psd) file. Then, when you are ready to save the file in TIFF format, choose File > Save As. In the Save As dialog box, choose Format > TIFF, select Save As A Copy, deselect Layers, and click Save.

Don’t export the Clipboard

The Export Clipboard setting allows Photoshop to export anything copied to the Clipboard as a PICT file (Photoshop CS4) or as a TIFF file (Photoshop CS5). Exporting is time consuming and occurs automatically, anyway, whenever you quit Photoshop or go from Photoshop to another application. Deselecting this setting improved Photoshop performance.

1. Choose Photoshop > Preferences > General (Mac OS) or Edit > Preferences > General (Windows).
2. Deselect Export Clipboard.
3. Click OK.

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Optimize the OS for Photoshop

• Close unnecessary applications and startup items
• Run Disk Cleanup (Windows)
• Defragment the hard disk
• Install current OS updates
• Specify a fixed virtual memory (Windows)
• Run periodic maintenance scripts (Mac OS)
• Disable VM buffering (Mac OS)

Close unnecessary applications and startup items

Other open applications and startup items decrease the amount of memory available to Photoshop. Quit unnecessary applications, startup items, and extensions and then make more memory available to Photoshop. See the following topics in the Adobe OS troubleshooting support documents:

• Run or reinstall the Adobe application while no other applications are running (Windows) 
• Disable extensions using Extension Manager (Windows)
• Run the application while no other applications are running (Mac OS)
• Run the Adobe application with login items disabled (Mac OS)
• Disable extensions using Extension Manager (Mac OS)

 Then, see Memory Usage for instructions on allocating more RAM to Photoshop.

Run Disk Cleanup (Windows)

When you work in an application, a copy of your data file is stored temporarily on the hard drive. Many applications create .tmp files and then delete them when you quit the application. Crashes or system errors, however, can prevent an application from deleting these files, causing them to take up disk space and create problems. From time to time, run Disk Cleanup to remove temporary files and any other files that are not being used.

1. Do one of the following: 
   * On Windows XP: Choose Start > Programs > Accessories > System Tools > Disk Cleanup.
   • On Windows Vista/Windows 7: Choose Start, type Disk Cleanup in the Search text box, and choose Disk Cleanup from the Programs list.
2. Choose a drive to clean up, if appropriate.
3. Select Temporary Files and any other files that you want to delete.
4. Click OK.

Defragment the hard disk

As you add, delete, and move files on a hard disk, its available space is no longer a single, contiguous block. If the system does not have enough contiguous space, it saves fragments of files to different locations on the hard drive. It takes Photoshop longer to read or write a fragmented file than one saved to a contiguous location.

For instructions on defragmenting hard disks on Windows, see these Microsoft Help topics:

• (Windows XP) “Maintenance tasks that improve performance.” Follow instructions under “Step 4. Defragment your hard disk drive.”
• (Windows Vista) ” Improve performance by defragmenting your hard disk”

On Mac OS, use a disk utility such as Apple Disk Utility, Symantec Norton Utilities, or Micromat Drive 10. For more information, see Defragment the hard disk and check for errors.

Note: RAID arrays don’t become fragmented. Fragmentation is more likely to be an issue if you use a single disk for everything. It can also be an issue if permanent files and the Photoshop scratch disk share a volume, especially if there’s not much free space. In this case, defragmenting the disk can make a significant difference.

Install current OS updates

Updates to the Windows or Mac OS X operating system improve its performance and compatibility with applications. 

Get Windows service packs and other updates from the Microsoft website. For assistance installing service packs and other updates, contact Microsoft technical support.

To get Mac OS X updates, choose Software Update from the Apple menu. For assistance installing updates, contact Apple technical support.

Important: Before you install a system update, check the system requirements for the Adobe software to ensure compatibility. (Also check any third-party software or hardware you use with the Adobe software.) If the update isn’t listed, contact Adobe or the manufacturer of your third-party software or hardware.

Specify a fixed virtual memory (Windows)

Virtual memory allows your system to use hard-disk space to store information normally stored in memory. It takes longer to access information on a hard disk than it does to access information in memory. Therefore, using a portion of the hard disk as virtual memory can decrease performance. Also, Photoshop cannot use the hard-disk space the system uses for virtual memory for its scratch disk files. (It uses the scratch disk to store image information as you work.)

Specifying a fixed virtual memory setting helps prevent Photoshop scratch disk files from competing for the space with virtual memory. Especially if you set the virtual memory setting on a different drive from the primary scratch disk. For both kinds of virtual memory, be sure to use a drive with enough free, contiguous space and for the best performance. Also, keep the Paging File on a separate, empty, defragmented hard disk.

To change Virtual Memory in Windows XP, quit all applications and then do the following:

1. Choose Start > Settings > Control Panel and double-click System.
2. Click the Advanced tab and then select Settings in the Performance section.
3. Click the Advanced tab, and in the Virtual Memory section, click Change.
4. From the Drive list, select a hard drive that has 1.5 times the amount of your computer’s installed RAM. For example, if your computer has 2 GB of RAM, select a hard drive that has at least 4 GB of free space.
5. In the Paging File Size For Selected Drive section, select Custom size. In the Initial Size box, enter a value equal to the twice the amount of your computer’s installed RAM.
6. In the Maximum Size box, enter a value equal to four times the amount of your computer's installed RAM.
7. Click Set and then click OK.  
8. Click to close the System Control Panel Applet.
9. Click Yes in the System Settings Change dialog box to restart Windows.

To change Virtual Memory in Windows 7 and Vista, quit all applications and then do the following:

1. Choose Start > Control Panel, and double-click System.
2. Choose Advanced System Settings in the Tasks list.
3. Select the Advanced tab and click Settings in the Performance section.
4. Select the Advanced tab and click Change.
5. Deselect Automatically Manage Paging File Size For All Drives.
6. Click each hard disk letter to show the available space on that drive. Select a hard drive that has three times the amount of your computer’s installed RAM and doesn’t contain a scratch disk.
7. Select Custom Size, and type the amount of your physical RAM plus 300 MB in the Initial Size box. Type three times the amount of your computer’s installed RAM into the Maximum Size box. 
8. Click Set, and then click OK. Continue to click OK to exit all dialog boxes.
9. Restart the computer: If you have applications open, select Restart Later, close your applications, then restart Windows. Otherwise, click Restart Now.

For more information, see these Microsoft Help topics:

• (Windows XP) “To change the size of the virtual memory paging file”
• (Windows Vista and Windows 7) “Change the size of virtual memory”

Also see Virtual Memory, an excerpt from Real World Photoshop CS5 for Photographers (Peachpit Press), by Conrad Chavez.

Run periodic maintenance scripts (Mac OS)

Mac OS runs background maintenance tasks overnight to do things like clean logs and temporary files. If your computer is turned off or asleep at night, then those tasks are not performed. Run a utility such as CronMaster to manually perform these tasks, or run them using Terminal. See Mac OS X: About background maintenance tasks (article HT2319) on the Apple support website for more information.

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