@Override
	protected FGVertex getInitialVertex() {
		FGVertex focused = super.getInitialVertex();
		if (focused == null) {
			return functionGraph.getRootVertex();
		}
		return focused;
	}
A somewhat arbitrary value that is used to signal a 'big' graph, which is one that will
slow down the system during the rendering process.
Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/graph/FGComponent.java