Hello,
I agree the graph is challenging.
May I suggest using the new network insights report: https://community.hpe.com/t5/LoadRunner-and-Performance/Uncover-the-potential-of-Network-Virtualization-Insights-now/ba-p/6895504#.WCTvhvl974Y
This report is available for both LoadRunner and Performance Center and gives a more user friendly representation of the data.
Regards,
Shlomi