DislikedBronco: its probably not the matching engine but the quote servers. I had lagging quotes during fast markets very often but executions were inline with the 'real' market. But that was more than a year ago (on navigator btw). I would recommend comparing your executions with another price feed and see if your slippage is only due to lagged quotes. This is an ongoing problem since like forever.Ignored
I'm not insane; my mother had me tested.