Currently Being ModeratedNov 17, 2012 3:15 PM (in response to jackbauer14)
This probably has more to do with hardware (processor, RAM, SATA v. SSD) than software (OSX).
To make the most dramatic difference in speed, you might consider replacing your hard-drive with a solid state drive (http://eshop.macsales.com/shop/internal_storage/Mercury_Extreme_SSD_Sandforce/So lid_State_Pro). This costs between $75-$400 (depending on storage capacity)
To make a moderate difference in speed, you might consider replacing your RAM chips with larger capacity chips (http://www.crucial.com/mac/). This costs between $25 and $75 (depending upon your computer and on storage capacity).
Other things to think about:
(1) Is your hard-drive almost full. This can cause CPU to slow down?
(2) How old is your machine. After a couple years, SATA hard-drives (the ones with the spinning disk) begin to slow down (e.g. a 5400rpm drive might max out at only 3500rpm or 4000rpm after while).
Finally, a visit to the Apple Store never hurts. You can always make a reservation at www.apple.com/retail. A Genius will be happy to run diagnostics on your machine and give you some suggestions for improving your Macs performance.