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Very poor analysis - I see no evidence of a memory problem. On the contrary, the system appears totally unconstrained.
With a system like that I trust you are running something like RHEL - in which case you should have sar running. I think you should spend some time investigating its data to try to ascertain where the problem (if any) may lie.
According to both ps and top, memory is mostly empty. And even if it was full -which it isn't- it would still be fine, as long as you are not hitting the swap too hard. So I'd look elsewhere.
your_shadow03, try to describe the actual symptoms. Which apps are slow? In which way are they slow? Does it happen to text mode applications outside X or into an xterm? Are there cpu peaks here and there? Try to describe the issue a bit better, since there's really nothing abnormal in top nor ps.