Hi All, According to vicirek above, I can request market data with maximum rate of every 20ms; according to my experiment, I get the response is from 0.8 sec to 5 sec; without getting the response I cannot do the next request, unless I use multiple internet connections to IB and send out request every 20ms. I do not get the market data response rate as advertized, am I missing something here? Thanks in advance.