If you are facing a price that can be closed quickly, for example, if you buy it, close the position at the purchase price.

What you sell is to close the position at the selling price, and I guess you can even it out.

Furthermore, you still have 15 seconds, you think, you started to place an order before 15 seconds, but if the network speed is stuck.

Or the transmission of your trading software and so on. , enough to affect 15 seconds, unable to clinch a deal.