Currently Being ModeratedJul 10, 2013 11:24 AM (in response to garyfromwaynesboro)
How large is you HD and how much space do you have left?
Check out the following & do the necessary: User Tip: Why is my computer slow?iMac (3.2 GHz, Intel Core i5-2013), OS X Mountain Lion (10.8.4), Fusion Drive-3.12TB, 32GB RAM
Currently Being ModeratedJul 10, 2013 12:28 PM (in response to garyfromwaynesboro)
Do NOT use/install "software to clean up and speed up". These make things worse always.
The reason can be a disk that is not fit anymore, too less disk space, too less memory, apps running that you do not need, antivirus apps, antimalware apps, etc.
It would help avoiding questions when you download Etrecheck (www.etresoft.com), run it, and copy the result here.