If you never changed the default performance settings in yourPhotoshop or you just want to double check them to improve thePhotoshop performance, here are 10 important and useful points that you may want to consider.

1. Adjust The Number Of History States

Maybe you already went through that bad feeling of clicking “undo”dozens of times and realizing that Photoshop wouldn’t provide you withmore previous steps, but this problem can be easily resolved bychanging the History States setting in the “Edit > Preferences > Performance” menu.

There are more efficient ways of going back and forward in yourprojects like using the “Snapshots” feature, which are essentiallycomfortable checkpoints of your work that you can go back to. But ifyou use Undo a lot, you may want to consider adding more states, e.g. set them to ‘30′. However, be aware that too many states on a single image will usually result in History Palette literally “eating” RAM and if you work with less than 2GB of RAM, you probably shouldn’t using the Undo Feature that often!

Overall, you may add up to 1,000 history state levels in Photoshop.

2. How Many Cache Levels Do You Need?

The Cache Levels setting can be found inside the “Edit >Preferences > Performance” menu, right under the History States. Itcontrols the histogram and the time it takes an image to reappear onthe screen after an action is applied to it.

By default, there are 6 cache levels; the number of levels can be increased to the maximum of 8which will – obviously – increase the rendering speed. It is particulareffective when you are working with high-resolution images. When workinwith smaller view-sizes, e.g. viewing an image at 50% Zoom, the cachelevels will determine the number of “down samplings” allowing Photoshopto perform operations faster.

Photoshop uses Image Caching and if you have a good amount of RAM,like at least 2GB and work with high-resolution images, you might wantto raise the level to 8 as the speed performance will compensate thememory loss, but if you have a low RAM amount and usually work withsmall images only (1-4MB), you may want to lower the value to 1 or 2 asthe RAM will be better allocated – storing the images rather thencaching them.

3. Keep An Eye On Your Memory Usage

Photoshop really likes RAM and will use every little bit it can grab, but it also allows you to limit the RAM resources of your computer that Photoshop will use,and it even gives you good suggestions for the appropriate range of RAMvalues it wants. This setting, of course, can be found inside the “Edit> Preferences > Performance” menu, on the Left Side.

The displayed available RAM is the value left for applications afterthe Operating System loads into memory. If you are going to use mostlyonly Photoshop, or if you have a low amount of memory, you willprobably want to give it 75-80% of the available RAM. But if, on theother hand, you are more of a multi-task kind of person with browser,word processor, mail, Twitter client etc. being always opened, then youmight want to limit Photoshop to around 50%.

Efficient Use of Memory

After setting up your memory values, you can keep an eye on howPhotoshop is performing. At the base of your image window, click to theright of the document size information and you will be able to choose“Efficiency” which will show you a percentage value. If this value isnot 100%, it indicates that if you allocate more RAM to Photoshop, the operations would perform faster.Closing applications or images that you are not using can also increasethe efficiency – not exactly a secret, but worth mentioningnevertheless.

4. Use Proper Scratch Disks

Similar to what happened with RAM, Photoshop also uses a good amountof your hard drive space as the so-called “scrath disk” which works asthe secondary memory resource. Photoshop assumes that your primary hard drive is its scratch disk, but you can set it up differently with a secondary internal or external hard drive.

If you are going to work with large images, it is recommended thatyou have a dedicated scratch disk that is different from the onecontaining the image file. Using different scratch disks is good,especially to avoid killing your primary boot drive when you have justa few gigabytes left.

5. Turn Font Preview Off

Photoshop users (and especially designers) like to have a goodselection of fonts always installed and ready to be used; but when thefont preview is active, having too many fonts can slow you down. Turning the font preview feature offcan be a simple and instant step towards improving your Photoshopperformance. To do so, simply go to the “Edit > Preferences >Type” menu and remove the check mark from the “Font Preview Size”option, just as it is shown in the picture above.

6. Use Thumbnails In Your Palettes

Displaying preview thumbnails in the Layers, Channels, and Pathspalettes will cause Photoshop to consume some more of your RAM as itwill be constantly updating the thumbnails to reflect the changes youwill be doing in your project. The memory consumption will keep growing with the amount of thumbnails you have opened at the same time as well as their size.

You could use the smaller thumbnail size or no thumbnail at all toincrease your Photoshop performance. To do so, in each palette, select“panel options” from the palette menu as it is shown on the pictureabove and select the smallest thumbnail size or “None”.

7. Learn How To Use Purge

When you are working on your images, Photoshop stores image data forthe Undo, Clipboard, and History features. This data consumes memory,especially if you have been working for a while and have a high numberof History States defined (see Point 1 for more on History States).

To eliminate that extra image data consuming your RAM, go to: “Edit> Purge > ( option )”. Keep in mind that clearing History willremove all the history states saved previously and you will not be ableto undo your latest actions.

8. Set Maximize PSD And PSB File Compatibility to Always or Ask

Maximize PSD and PSB File Compatibility increases the size of yourfile by attaching a flattened copy of your image when you save yourimage. A small amount of extra data is included in the file when youchoose this option that ensures that PSD and PBS files saved inPhotoshop will open in previous versions.

Additionally, if you want to use the Edit in Photoshop feature inPhotoshop Lightroom, this option needs to be on. To change the MaximizeFile Compatibility option choose “Photoshop > Preferences > FileHandling”.

9. Don’t clutter your Photoshop

Of course, you can easily find an enormous amount of free stuff toadd up to the default Photoshop brushes, fonts, patterns, etc. but thatdoesn’t mean you need to download every freebie that comes in your way.Keep it simple! Having too many plugins and other resources installedin Photoshop will greatly decrease performance. Most top designers usea small selection of fonts and brushes that define their style and thatcan be used in a great amount of ways for literally millions ofdifferent results.

10. Reset Default Settings

If you are using a shared machine for your Photoshop needs there is a little Photoshop start-up trick that may come in handy. When the application is launching, if you press and hold: Alt + Control + Shift (Windows) or Command + Option + Shift (Mac),a window will pop up asking you if you want to delete the Photoshopsettings file, resetting all of the preferences to their default.

Further Resources

• Optimize performance of Photoshop CS4 on Windows XP and Vista
• Optimize performance in Photoshop CS4 on Mac OS
• Top 10 Killer Photoshop Combo Moves
  Istime kickin’ your ass? Well, learn to defend yourself! Master thesekiller Photoshop keyboard combos and you’ll find yourself with moretime for the important things (e.g. Facebook trivia questions). Thesecombos assume you’re using Photoshop CS3 on Windows platform withdefault keyboard shortcuts.
• Professional Tips for Improving Photoshop’s Performance
  Inthis tutorial, you’ll take a look at the Photoshop Preferences toincrease your Performance. Depending on the Photoshop version, featuresfor working with 3D imagery, motion-based content, and advanced imageanalysis, greatly increase the requirements of both graphics andhardware.
• 20 Time-Saving Tips to Improve Designer’s Workflow
  Wantto save some time? Of course you do! You are probably always lookingfor ways to do this faster and make that easier, it’s human nature! Oneof the best ways to save time is experience. So always stay hard atwhat you do and you will definitely save more than “just” time!

About the author

Marco Sousa is a blogger, computer engineer student and webdesign enthusiast. He is also one of the co-founders of Scarletbits.com, a blog dedicated to high quality freebies, news, tips and tutorials for the web design community.

http://www.smashingmagazine.com/2009/08/13/10-simple-steps-to-better-photoshop-performance/