This is how the Activity Monitor within OSX should operate

The Stats Bar app is great! It performs as advertised and is very helpful in the information it provides. It’s a clean, non intrusive view of the health of your Mac. At a glance you can see your CPU performance, Memory, Disk Usage, Network (both WAN and LAN IPs), but most importantly it allows you to view the health of your battery life for your MacBook.

Honestly, this app should come standard with OSX, Apple could learn a thing or two from this app.

Solrac2k about StatsBar: System Monitoring