Mac OS V10.4.11 2.15 GHz Core 2 Duo 1 GB 667 MHz DDR2 SDRAM HD - 162 GB Available: 117.9 GB Used: 44.1 GB Firefox 3.5.3 and Adobe CS3 apps. running very slow. Especially CS3 InDesign. Rainbow pinwheel occurs frequently especially on closing apps. Diagnostics passes on start up. Seems to have begun concurrent with downloading Firefox 3.5.3. about two weeks ago, but really bad today.