ZEN isnt faster, ZEN sends all ticks, but IB is often faster trasmitting price changes. My distance to IB and ZEN is the same, so when i can see differences in Price chages (sometimes 0,5 to 1 sec) then that has nothing to do with good or bad Internet conections.
Only because on ZEN you cant read the numbers on Level II or on Times&Sales, means that its faster. Check it exactly as i did, and you will see, I am right. I was on the way to change to ZEN because of the hype in different trading rooms, but now i am happy with IB.