An Extension that measures round-trip delay for cometd messages.

It can be useful to measure the performance of cometd messages. Although the TimesyncExtension can tell you the network delays, there's no way to measure the processing delays on the server.

The StatisticsExtension sends out probe messages to all clients and measures the entire round-trip delay. Knowing the network delay, then one can obtain an idea of the server-side processing time.