Unity3D CPU Usage

I recently got a Macbook Pro (http://www.apple.com/macbook-pro/) for specifically developing games with Unity. Many people in these forums and others swore by these computers to be the absolute best to develop Unity games on. But as I've only just begun delving in the program, I realize it's using 7.3% of the CPU when the game is not even focused. I'm not doing any 3d modelling or anything. I am actually making a simple 2d tic-tac-toe game so I can get more familiar with how to use the program in a Mac OS environment.

What I'm wondering is why is the Unity program taking up so much of the CPU when it's just sitting idle or not even being focused? I thought Macs were more efficient when it came to resources. Also, the fan turns on almost immediately (and it's pretty loud) as soon as I start up the program, as well as the bottom of the laptop gets hot fairly quickly. This only happens when I run Unity. I have no other programs open when I run Unity.

Is this a known issue with the program? Is there anything I can do to reduce the amount of resources/CPU the program uses? I am mainly using Unity to develop 2D games. I don't plan on doing any 3D stuff, so if there are any 3D components I can disable in the program that might free up CPU resources, that would be great. If not, what can I do to preserve the system resources when I use Unity?

I hope this makes sense. Thanks in advance!

 

You are not alone. Please vote for these to get the word out:
http://feedback.unity3d.com/suggestions/better-support-for-guionly-appl
http://feedback.unity3d.com/suggestions/realtime-input-framerate-indepe