I am working on an academic research about networks. I have proposed my model a a graph that nodes are users with commodity hardware connected to each other via internet as graph links. I know this is a weighted graph. My question is:  
*How can I score links based on different features such as throughput or distance between users?*  
I have read several papers. One of them had a figure that shows the relationship between throughput and distance with packet loss:  
[![enter image description here][1]][1]  
I can't understand why packet loss increases when throughput increases. Isn't throughput a positive aspect?


  [1]: https://i.sstatic.net/5EKxg.png