Are you trading remote? Or maybe using one of the 5 NQ servers? Cuz I'm trading NY and my system was HORRIBLE today! Don't even mention the 10am volatility it's just a given it'll have problems. Any spike in volume after that I will get stuck ARCA and stalled quotes. Refreshed the quotes at least 10 times it's getting ridiculous! Running on 5M cable with new DELL core2duo computers