From: http://www.cgonline.com/features/011109-f1-f1.html

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Since we want users to find the best server possible, we try to incorporate both the travel time and the server processing time in our ping rates, call this the “server load ping.” The server handles the “server load ping” message as it would any other message, placing the message into the server queue and responding to the message once the rest of the queue has been processed. However while travel times (the “classic ping") show little variation, server load fluctuates a lot depending on the number of players, projectiles, and other objects active in the game. As a result the “server load ping” jumps around a lot in comparison to the “classic ping.” Also, since the “classic ping” ignores server load, the “classic ping” is a lot smaller than the “server load ping.” So while “classic ping” returns lower numbers than “server load ping,” “server load ping” should hopefully give you a better performance measure when picking the optimal game server.

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