Comet, responseText and memory usage?

That's just how long-polling works. You keep an index into the last line number read and with each tick of your interval read from that point onward. It's one long connection, thus one long response.

Contrary to the other response, "long-polling" is not one long connection. "Long-polling" is many connections in sequence, each set up to stay connected for a reasonably long period of time if no response is needed. They do time out (typically around 25-30s), and then re-establish a new connection.

Since HTTP1.1 allows for re-use of existing connections, the connection doesn't have to be re-negotiated, and can therefore be re-established virtually instantly.

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