Had this problem recently, was killing my battery-life. Came up with this method of finding out what the problem was, in my case ‘EXFM’.
- Go to Task Manager or Activity Monitor, and kill the Chrome process that is using the most CPU.
- Chrome should tell you what extension crashed.
- That extension is what’s making Chrome high CPU.
- Uninstall that extension and you’ll be fine. :)
If it doesn’t work do a fresh install of the latest STABLE Chrome.
EDIT: Flash Player 10.2 has been released today. Which means Flash based video shouldn’t impact CPU as it runs through Hardware Accelerated GPU.