Installed on my desktop just to see if the issue was isolated to my laptop. After doing so, it looks like on that machine the CPU usage ranges are much lower, but honestly still fairly high given what Decor8 is suppose to be doing. It is typically 3-6%, but can be as high as 10-13% on the machine.
Given that machine is a Sandybridge 2600k, high usages won't be nearly as noticeable percent wise simply because there are physically more resources.