This page contains a basic guide on latency (ping) in League of Legends (LoL), including its definition, impact on the game, and acceptable levels during play.
Latency (Ping) Guide
All online games connected to a server are affected by the time data travels from your computer to the server itself. This is called latency (or ping). A very high latency will cause you to experience delays in action during gameplay, ranging from minor to severe (which may make the game completely unplayable). On the other hand, a very low one will allow you to run the game smoothly and perform to the best of your abilities during critical moments in the match.
Since League of Legends (LoL) is a team-based Multiplayer Online Battle Arena (MOBA), it is almost unforgivable for any player to be experiencing heavy latency, especially during Ranked Matches. This makes you unable to respond to the current team situation during combat which earns the ire of all of your teammates.
During gameplay, the latency will also be displayed on the upper right corner of the UI. It is next to the FPS indicator.
You can check your latency during the loading screen by looking at your Champion’s portrait at the lower right. It will be indicated by a circle that changes color from green (stable latency) to red (bad latency).
What is ‘Acceptable’ Latency?
In most cases, playing at a latency (ping) of not more than 40 ensures smooth gameplay in general. And while some people have claimed that having as high as 70 is still manageable (though this level still has very noticeable lag), we do not recommend playing under these conditions during Ranked Matches.