The blockchain was a bit congested just now, and I was watching the mempool queue list with even more anxiety... To put it simply, clicking "send" just puts the transaction into the waiting room; miners/validators pick the ones that offer higher tips first. If you send too little, it stays stuck, and sometimes gets "bumped" by similar transactions coming later, feeling like being cut in line. Others think that once it's sent, the deal is done, but in reality, it might hang there for half an hour, during which the price could have already moved out of sight. Recently, before and after the main chain upgrade/maintenance, the group has been guessing whether projects should migrate. I personally care more about this: congestion = slippage + priority fee + emotional trading, and with leverage on, it's easier to be forced into reckless operations... Now I just set an alarm and, if it takes too long, I cancel the order or reduce my position—survive first, then talk.