It seems that the counter at the bottom counts all updates, and ends up at 2380, so the overall rate would be something like 4760/second, or 17M/hour. Note tha

It seems that the counter at the bottom counts all updates, and ends up at 2380, so the overall rate would be something like 4760/second, or 17M/hour. Note that the rate has slowed down considerably before .25 seconds have passed, and this was recorded within 10 minutes after NYSE opened, so I suspect this is a bit above the average rate. Also, these are bids and offers, not actual trades.