My CPU is running at 100% for 5-7 seconds then drops to 60%ish for 1-2 Seconds then back up to 100% - Everything is very slow. Web sites take 20-40 seconds to load sometimes they dont load, after a wait of around a minute I get impatient and refresh and wait again. This is on multiple computers. TV streaming ( which I hardley ever stream) buffers often. Rebooting router doesnt seem to help- I have a daily reboot schedule set and no USB device.

Any suggestions?