Norton 360 Performance shows CPU very high, like 90% plus. I have done the Repair function. I have logged into Norton and performed a "Remove" which actually Removed and Restored Norton. For a few days the CPU remained low. Now it it back up into the 90s. If I sit and watch CPU, without any user clicks, CPU will drop down low and randomly return high.
I don't know if it is related, but sometimes Web page loading is painfully slow. The similarity is that CPU and Web page loading slow down in inexplicable waves.