Capacity (Quotes per Second) per multicast line all 12 multicast lines
Before July 5, 2011 75,000 750,000
Starting July 5, 2011 100,000 1,000,000
The following charts plot each of the 12 individual CQS multicast lines and the total (which is divided by 10 to fit into the same scale) on a 1 millisecond basis.
The first chart shows one micro-burst of activity as it occurred on July 5th, 2011, which is the first day after CQS capacity was increased by 33% to 1 million quotes/second.
The second chart shows how this same data might look if we imposed the capacity limits that were in effect prior to this trading day.
Source: Equity Quote Saturation
July 7, 2011