The Bake Texture command allows to visualize lots (or all) countries or provinces in colors without incurring in a performance hit (the colorized areas are baked into the current texture so for those cases where you need to colorize lots of countries this will be the way to go).
This command is available from the gear in the inspector title bar:
The generated texture will be saved into Resources/Textures folder in the file EarthCustom. From this moment, you can select the new baked texture from the Style combo and choosing “Custom”.
An example of a generated texture is shown below. To colorize all countries, instead of the Decorator component, a simple loop for all countries was used assigning a random color using the API ToggleCountrySurface.