Quote from DonCorleone:
Does the quote get lagged when there's a volume surge - ie, fomc, econ data release, etc?
I havent had a problem with lagging quotes in ages. The only thing that lags is 'open book' for the first 5 mins of the day. So I just turn it off for the first 5 mins. Works fine after that. I don't mind putting up with that as the 'open book' is integrated in the level 2. So going without it for the first 5 mins is acceptable to not have to look at a seperate window to see the NYSE book the rest of the day.
It used to be a mess after the FOMC, a couple ecn books were sure to get stuck/start lagging. It's been fixed and works flawlessly at all times including FOMC decisions.