You execute manually right? Click on a button? Then 250ms are irrelevant. You should anyway check into how you can get those spreads/baskets/combos executed via IB algorithm so the legs get filled for you
Yeah i underatand that. Well umm its "manual" but i put pending order manually which needs to be triggered as soon as Bid hits the sell trade. And that happens for a very short period of time.
For example spy-ivv... those kind of spread