From Second Life Wiki
- How do I check for packet loss (network lag)?
- How to find FPS, Packet Loss, Ping Sim and Ping User
- How can I get a better idea of what my packet loss is?
- I have a lot of lag. How can I improve performance?
- Second Life gives me an error message about mangled network data. What does this mean?
- I know I have a fast Internet connection, but Second Life seems to download items slowly. How do I make things faster?