Lag

Lag, from "lag behind", is a slang term for slow Internet speeds, or internet latency, sometimes due to a server problem, but more frequently due to the connection between client and server.

In language, the term "lag" could be used as follows, "Gee, anybody else noticing that BambooWeb is lagging periodically, or is it just me?" This statement illustrates that lag is experienced differently by different clients and perceived differently by different users.

In computer science, proposals to alleviate lag are part of Quality of Service.

Lagger

A lagger (occasionally, High Ping Bastard) is someone who uses a slow 56 kbit/s modem to connect to the Internet, then joins a multiplayer online game (usually a first-person shooter) and who has a high ping time. In synchronous games, where all clients must know the exact game state, a single "lagger" will slow down the game for everyone, since the server has to wait for the client to get every communication packet. However, many online games use an asychronous communication model, allowing the clients to continue even if they drop occasional packets.

Low Ping Bastards

Low Ping Bastard or LPB is a phrase that originated during the time when Quake was a highly popular multiplayer online first-person shooter. The term came into common usage when broadband Internet connections first came into the reach of home users and were competing with people limited to a 56 kbit/s or slower modem connection. This term was so widely used because of the havoc wreaked upon the other users of these servers by the low ping bastards due to their overwhelming advantage in reaction time afforded by their connection.