Speed up your Adobe Photoshop
Adobe Photoshop is one of the great programs from the Adobe Creative Suite, but probably also one of the "heaviest" programs for your system resources. So everything you can do to speed things up is welcome I guess.
Here is something I've read long time ago and use ever since. Every time I install Photoshop this is the first thing I do.
Go to Adobe Photoshop's Preferences and go to Performance. Make sure there is a reasonable amount of RAM (Memory) that Adobe Photoshop can use. But don't forget that your system also needs memory to work with. Too much for Photoshop will mean less for your system.
Also, change the cache level back to 1.
Optional is the History States. This is the amount of Undo's you can do on your current document. 20 means that Photoshop will remember 20 states of your document. You can lower this, but this means less undo's.

After this is finished, we go to the next tab called File Handling. Choose Never Save in the dropdown box at Image Previews. This simple option will speed up your Adobe Photoshop considerably.

The screenshots you see here are from Adobe Photoshop CS5, but I know for a fact that this also works for Adobe Photoshop CS4. I don't have CS3 anymore, so I can not tell for sure if these options are present in that version or before.
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