I have an iBook G3, 700mHz, 20Gb HD with the RAM maxed out at 640Mb. It is running 10.4.3, just installed the OS recently. It was running fine after I installed Tiger, no speed problems, but all of a sudden it's become incredibly laggy. I get our lovely friend the colour wheel showing up with every single thing I try to do, even just clicking on an icon on the desktop and waiting for it to be highlighted to show it is selected or when trying to move a window. I have over 13Gb free on the HD and when I checked the activity moniter, it doesn't seem to show anything wrong... says that 450+Mb of RAM is still free and that 85%+ CPU is idle. I'm not running anything but the finder and dashboard. Any ideas?