Quote from OffShoreTrader:
I'd be very surprised if Zen is really faster than xt. Trading over the internet introduces uncontrollable congestion at times - also, bad ticks in the euro are data feed problems not GUI (NT) problems.
Your points make sense. That said I ran XT right next to Ninja Zen and NZ appared a blink faster. But I was using an older version of XT free version from Velocity.