Based on the VCG code, the company AbsInt has developed a visualization tool AISee . I'm not involved in the AISee development anymore. As far as I know, it is free for research usage. The VCG tool is not a graph editor. It is intended to visualize large graphs that are automatically generated by programs, e.g. debuggers of data structures.
Speed is always the first priority.
3983 edges consists of 21694 internal nodes and 23540 internal edge segments. The times include time for loading, layouting and displaying. Time limits can be specified for the layout. If the time limit is exceeded, the tool switches into the fastest and ugliest layout mode. The layout algorithm can be controlled in different ways.