This is true, positive slippage can also occur when there is a delay in execution. But as a professional trader, one has to ask the question: who wants this uncertainty in their life? With a stop order native on Globex, 99 times out of a 100 you will be filled at that exact price. Your risk is firmly pre-determined. Even if the delay is only milliseconds, it also doesn't get around the problem of having your order ranked at the bottom of the priority list as far as Globex is concerned when filling it. Nor can it alleviate the risk that IB datafeed problems at the 'wrong' time can really mess you up ...with an unexecuted order. I stand by my comments that the way IB handles stop orders is a major negative for the futures trader. They should fix it ASAP!