Hello, I bought my iMac about one year ago. The specs are: 2.8 GHz i5 Processor, 4 GB 1333 MHz DDR3 of RAM and 1TB HD with Mac OS X 10.6.8 installed. When I bought this iMac it used to work really fast, Safari opened up in a second, so did iTunes (with almost the same songs as now), now it takes about 10 seconds plus beach ball. Photoshop took no more than 3-5 seconds, now it takes about a minute and I have not installed anything more than some brushes. When my iMac was new, I never saw the beach ball, now it is normal to see it when I am browsing with safari or using photoshop. One weird thing that is happening lately is that safari reloads the webpages like in the old iPad when it ran out of memory, so I am browsing with a few tabs opened and suddenly they all refresh. My iMac does not have many things installed, I still have 639 GBs available and I have a 200GB partition for BootCamp. I was wondering how can I improve the performance of my iMac. Should I make a backup of everything and make a clean install? What maintenance apps should I download? Please tell me how can I speed up my iMac which should be running a lot faster. Thanks in advance.