imp.dmx imp.artnet.controller cpu usage insanely high

Hi,
I love the imp.dmx package and i'm trying to use it with the Enttec ODE to LED lighting in a new installation i'm building.
But the cpu usage is very high even when i only load one instance of imp.artnet.controller.mxo?
Max is using around 6% cpu when idle (with no patch loaded and dsp off).
Max is using around 100% cpu with one instance imp.artnet.controller.mxo loaded? The same goes when opening the helpfile. Why?

The strange thing is... this is not happening all of the time. When i close Max and replace the .mxo (with the same one) and restart Max then cpu stay low (around 12%). When i the close restart Max again the cpu is back up around 100% / 110%.

What should the expected cpu usage when using imp.artnet.controller?

I tested this on :
Max 7.3.3 both 32bit & 64bit

Model Name:    MacBook Pro
Model Identifier:    MacBookPro11,1
Processor Name:    Intel Core i5
Processor Speed:    2,8 GHz
Number of Processors:    1
Total Number of Cores:    2
L2 Cache (per Core):    256 KB
L3 Cache:    3 MB
Memory:    16 GB

And this one running Max 7.3.2 both 32bit & 64bit

Model Name:    MacBook Pro
Model Identifier:    MacBookPro5,1
Processor Name:    Intel Core 2 Duo
Processor Speed:    2,4 GHz
Number of Processors:    1
Total Number of Cores:    2
L2 Cache:    3 MB
Memory:    8 GB