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 with more previous steps, but this problem can be easily resolved by changing the History States setting in the “Edit > Preferences > Performance” menu.
There are more efficient ways of going back and forward in your projects like using the “Snapshots” feature, which are essentially comfortable checkpoints of your work that you can go back to. But if you 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. It controls the histogram and the time it takes an image to reappear on the 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 8 which will – obviously – increase the rendering speed. It is particular effective when you are working with high-resolution images. When workin with smaller view-sizes, e.g. viewing an image at 50% Zoom, the cache levels will determine the number of “down samplings” allowing Photoshop to 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 want to raise the level to 8 as the speed performance will compensate the memory loss, but if you have a low RAM amount and usually work with small images only (1-4MB), you may want to lower the value to 1 or 2 as the RAM will be better allocated – storing the images rather then caching 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 RAM values 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 after the Operating System loads into memory. If you are going to use mostly only Photoshop, or if you have a low amount of memory, you will probably want to give it 75-80% of the available RAM. But if, on the other hand, you are more of a multi-task kind of person with browser, word processor, mail, Twitter client etc. being always opened, then you might want to limit Photoshop to around 50%.
Efficient Use of Memory
After setting up your memory values, you can keep an eye on how Photoshop is performing. At the base of your image window, click to the right of the document size information and you will be able to choose “Efficiency” which will show you a percentage value. If this value is not 100%, it indicates that if you allocate more RAM to Photoshop, the operations would perform faster. Closing applic
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