private FGLayout getFunctionGraphLayout() {
		Layout<FGVertex, FGEdge> graphLayout = primaryViewer.getVisualGraphLayout();
		FGLayout layout = (FGLayout) graphLayout;
		return layout;
	}
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