1) IB sendssnap shot data, used to be every 7/10 of a second. This could have changed to be more frequent.
2) Pats data feed is throttled but I don't know the algorithm they use for throttling. You will get a lot more ticks from Pats than IB.
3) TT offers their FCM customers the option to throttle and the FCM can set this to zero (no throttle) or to update based on X milliseconds. Some FCM's leave it unthrottled (tick by tick) others may throttle it down to every 100 ms.
4) Zen-Fire offersunthrottled (unfiltered) tick by tick data
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