Well, it doesn't get any better than that from a CPU usage standpoint. I think your fine the way it is. As I said, I have noticed the browsers will sometimes cause heavy CPU usage for what I consider to be no valid reason. If I notice the computer acting sluggish, I start with the Task Manager, and identify the piggy program, and shut it down. Re-start it, and problem is nearly always solved.
PS. Monitor the programs in Task Manager if you suspect a problem. I noticed you run MarketDelta. I have noticed it is a hog at times, but its intermittent. I would only shut down a [program if it is constantly taxing your system.