Slow response when clicking between file photos since going to Mountain Lion
Some months ago I switched from Snow Leopard to Mountain Lion on my iMac. Everything works okay exceot that when I'm going through photos in files. After clicking on one, there's a delay for a couple seconds and then the pinwheel appears for two or three more seconds before the selected photo pops up. Everything else seems fine, but Snow Leopard never did this. My computer tech knowledge is very limited, but I did do what some prople already suggested such as making sure all other applications were closed, emptying the cache and clearing cookies.
So, I'm using OSX 10.8.5. The processor is 3.06GHz and the memory is 4GB 1067 MHz RAM.
I'd sure appreciate any suggestions.
Thank you
iMac (21.5-inch Late 2009), Mac OS X (10.6.8)