From appearances, they buy higher quality and better designed equipment. My guess is that whoever specced the gates, hadn't got a clue what they were doing.
Ironically it doesn't seem to be the processing time that's killing them, for the gates are even worse when you try and exit, and have no transaction to make - and you walk into them half the time, without them having opened yet. That's surely simply a function of there not being a long enough distance between the sensor and the gate.
They certainly feel a lot more flimsy than the gates you see in London.