public NoInterference() {
		super(false);
		if(firstTime && Configuration.interference && Configuration.showOptimizationHints) {
			Main.warning("At least some nodes use the 'NoInterference' interfernce model. " +
			             "If you do not consider interference at all in your project, you can " +
			             "considerably improve performance by turning off interference in the " +
			             "XML configuration file."
			);
			firstTime = false; // important to only have one message. 
		}
	}