Quote from def:
In an electronic environment, all market orders need to be converted to some limit. Thus speed should be the same. However, on some exchanges - e.g. specialist, nasdaq pre-supersoes, firms selling order flow, most option exchanges, etc - orders may get into the hands of a human or a system that allows a delayed fill. IMO that gives a free option for the counterparty and thus you may be giving away a few ticks or the spread. As rharp states, a limit order does not have to equal the offer or bid.
Thanx for the response def. What I'm still wondering is, under what instance, if any, does a hundred share lot, market order, Nasdaq stock, go to a human if one is trading at IB.
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