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The next set of preferences have to do with performance. Go ahead and click on that option here in order to begin to work with these preferences. Now, the first thing that we will encounter is Memory Usage. In this case we can define or determine how much RAM we are going to give to Photoshop. Now, Photoshop loves RAM. If there are two things to upgrade on your computers, it's your RAM and also your video card, and that will really increase Photoshop's overall performance. Now, in this particular case it's giving me a default setting of 70% of the available RAM.
Now, typically this is going to work really well. It's a nice default setting. Yet that being said, I have a few friends who are re-touchers and when they work in Photoshop, they are only working in Photoshop and in that particular case they crank this up, because they want to dedicate as much RAM as possible to Photoshop, and maybe they have Photoshop open with iTunes or one other application, their e-mail client or something like that. But really they are saying, you know what? When I am working in Photoshop, I want to give everything to this program, because I am going to push things pretty hard.
Now, in other scenarios, if you are more of a typical user, moving down to something like 70% will probably work best. All right. Well, let's move over to our History & Cache. This is now new inside of Photoshop CS5, and it's a little bit different and even a little bit awkward. We have a couple of different options. Tall and Thin, Default, and Big and Flat, kind of some funny words to describe how we can set these Cache levels. Well, what Tall and Thin is, if we hover over this, it will give us a little message that Tall and Thin has to do with smaller documents that have a lot of layers.
I mean dozens to hundreds of layers. Big and Flat on the other hand is really, really high-res files without lots of layers. If we click on these options, we can see how it's changing our Cache Level and our Cache Tile Size, and you can click back and forth to see how this works. Now, for most users, unless you are in a real specific scenario, going to that default setting is typically going to work best. The last thing to point out here is if you have a video card which supports GPU, it's definitely a fun idea and good idea to turn on Enable OpenGL Drawing, just because it can help you work a little bit more quickly and because it's kind of fun to use some of those features inside of Photoshop.
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