I have a 700 MHz iMac flat panel with 1 GB SDRAM and running OS 10.4.11. Almost every time I go to do something, I get the spinning ball and have to wait before it performs the action. I even get the ball briefly when I click OK on a dialogue box. I have run the disk utility to repair disk permissions several times, but that doesn't seem to help. What can I do to get the Mac to run faster as it used to do?