The class creates an array of color4b values, and the getColor method is like this

public Color4b GetColor(float x, float y)
{
    return colormap[(int)(x * (size - 1)) + (int)(y * (size - 1)) * size];
}

where size is the width/height of the map. To debug I put a breakpoint on the constructor, and hooked the output from the GetColor method to the plugin output. The debugger stopped at the constructor several times so I assumed it was creating a new instance for every coordinate.

Thanks for taking the time to look into it.

Not sure how I could reproduce it with vector3 since my issue happens when you connect the result it to the texture output node. 

Here is the code I am using http://pastebin.com/mHexqi01

I got it working if I use a static Create method , if I use the constructor like the image below it will create many instances of the class and hog all cpu:

But in the end I would like to specify the constructor arguments through lab and not make them predefined as they are now using the static constructor.