What's up with this new iMac

Aloha all, I just purchased a new iMac with the following - 27" 3.1 GHz Intel Core i5,with 8 GB ram, running OS 10.6.7. After using an G5 PPC for 7 years, I thought it a good time to upgrade.
My inquiry is page-ins, page-outs, & swap. I keep getting a large amounts of page-outs, & swap being used, especially when using Photoshop, & Photoshop Elements, but not limited to those programs. After what I think would just be normal usage, the same thing happens. Using my old G5 PPC for the same tasks I can't remember so many. I end up using Activity Monitor to check this now, pretty much daily, and they are always showing up. If anyone has any ideas or thoughts about why this is happening I'd really like to hear them. More importantly I'd like to know if there is a way to reduce them, or if should just ignore them.
Also this new machine doesn't seem much faster than my 7 year old PPC. Should I be concerned?  In the years I have been posting here I have always gotten good advice, so I'm looking forward to seeing the answers to my queries. Thanks for any time, tips, suggestions.        JB

About OS X Memory Management and Usage
Reading system memory usage in Activity Monitor
Memory Management in Mac OS X
Performance Guidelines- Memory Management in Mac OS X
A detailed look at memory usage in OS X
Understanding top output in the Terminal
The amount of available RAM for applications is the sum of Free RAM and Inactive RAM. This will change as applications are opened and closed or change from active to inactive status. The Swap figure represents an estimate of the total amount of swap space required for VM if used, but does not necessarily indicate the actual size of the existing swap file. If you are really in need of more RAM that would be indicated by how frequently the system uses VM. If you open the Terminal and run the top command at the prompt you will find information reported on Pageins () and Pageouts (). Pageouts () is the important figure. If the value in the parentheses is 0 (zero) then OS X is not making instantaneous use of VM which means you have adequate physical RAM for the system with the applications you have loaded. If the figure in parentheses is running positive and your hard drive is constantly being used (thrashing) then you need more physical RAM.
Adding RAM only makes it possible to run more programs concurrently.  It doesn't speed up the computer nor make games run faster.  What it can do is prevent the system from having to use disk-based VM when it runs out of RAM because you are trying to run too many applications concurrently or using applications that are extremely RAM dependent.  It will improve the performance of applications that run mostly in RAM or when loading programs.

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