Why is my macbook running slow when not plugged into AC power? It runs fine when its plugged in?

I have a late 2011 macbook 2.7 GHz i7. This wasn't a gradual thing, it just happened all of a sudden. I had upgraded to mountain lion of which I de-fragged my hard-drive thinking it was a hard drive issue, and am now running snow leopard but it hasn't made a difference. Is there like a energy saving option I am unaware of??  Please help, its driving me crazy. Its making my mac literally useless.

Use Onyx (free) to do a system cleanup (cache cleanup, permissions repair, etc.).

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    @wheng 
    ‎Thank you for using HP Support Forum. I have brought your issue to the appropriate team within HP. They will likely request information from you in order to look up your case details or product serial number. Please look for a private message from an identified HP contact. Additionally, keep in mind not to publicly post ( serial numbers and case details).
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    This diagnostic procedure will query the log for messages that may indicate a system issue. It changes nothing, and therefore will not, in itself, solve your problem.
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