Fresh ubuntu installation - memory usage went from 3% to 41% - should I be concerned and how to remedy?

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http://askubuntu.com – My memory usage was a 4% after a fresh ubuntu 12.10 installation after i install php packages etc using this gist, https://gist.github.com/4372049 my memory usage now reached 41%. should i be concerned? if not, then at what memory usage level should i be concerned? if yes, then what remedies should I do? UPDATE: based on suggestion to post my top followed by > (HowTos)