In a nutshell, not all programs are good about telling the system they're done using whatever bytes of memory they asked for, plus when programs use different pieces of memory from here and there, the overall available memory can get "fragmented", just like a hard drive, and the system will run slower trying to find information. A memory recovery program searches for unused bits of memory and tells the system it's there, and a good one will also defragment available memory for you. It's supposed to improve performance, and I believe that it does for most people. bonni

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