[ubuntu] hardware drivers

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http://ubuntuforums.org – Just installed ubuntu on my old acer aspire 5515 laptop for testdriving my first shackel free OS. sofar so good....looks promising, but running really reaally sluggish compared to windows, its a fresh install and assuming i need drivers. I go to system settings>hardware>addition driver..... it does a search then says "no proprietary drivers are in use on this system" any ideas on where to go from here? On windows I would just get on the net and DL my drivers, is it the same process here or....?? thanks (Hardware)