Option exchange for us stocks with low latency trading via IB

I usually route to EMERALD but the amend order latency is killing me. Does anyone have experience using other option exchanges that are faster to respond even when trading through IB?
 
I can't answer about latency through IB, but IMO Emerald is not a good choice in terms of quality of fills. If you wanted a single exchange to route, CBOE would probably be your best choice in terms of fills.
 
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