Is the number of posts on this forum a function of expertise? Good to know how some people think. Or are you just an asshole?
with their trades people, who are easily frustrated, pay for the mistresses and cocaine habits of floor traders. ok, it also pays for the college education of their kids
If you put in an order at $275 and the market is at $274.75, they likely won't fill yours until there are no more at the current bid/ask. and the next up, and the next up, and the next up. etc. This is a warning they tell you about when you do that. https://www.interactivebrokers.com/en/index.php?f=14186
It happened to me few hrs ago while trading other exchanges; market order was not executed even after one minute. Normally if you see such problem, you will see it again few hrs/days later. Very important to have another broker. So if one broker is having problem, quickily switch to another broker.
That's just with the max. price and min. price acceptable for buy and sell transactions respectively. It shouldn't have any bearing on how fast a market order is filled. A market order is a market order, it's supposed to be matched with the NBBO especially when the order price is even better than the NBBO by a quarter of a point. It should have been filled instantly.