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OPRA is a lot of data, it dwarfs all other exchanges, according to FIF June 2009: OPRA: 954,813 msg/sec NYSE & Amex Quotes: 160,145 msg/sec NYSE & Amex Trades: 22,328 msg/sec CME Trades & Quotes: 14,691 msg/sec If you don't receive OPRA NxCore can easily process all of the equities and...

I've used both IQ Feed and NxCore, they are both provided by DTN but are completely different systems. I started with IQ Feed which is good for an individual trader that is monitoring a few hundred symbols. I upgraded to NxCore because I want to scan the entire market. I can see large blocks and...