Last night I got a little impatient and placed an order, but it got stuck in the mempool queue, staring at that "pending" status made my blood pressure rise... Basically, you put your transaction into the public waiting room, and miners/validators pick the "more attractive" tickets first, low-fee transactions just stand there waiting, and during congestion, they might even be bumped by more expensive ones coming later. What's more annoying is you think you've entered the market, but in reality, the price has already moved away, and in the end, you either get filled at a high price or it expires and fails, wasting a lot of emotional energy.

Recently, that mainstream blockchain has been upgrading, and it's quite interesting. Everyone's guessing whether the ecosystem will move away. I think it's better not to think too far ahead: first, control how you get caught up in congestion, how you get manipulated into changing orders or chasing prices recklessly. My approach is very simple: when I see the queue, I hold back, set acceptable slippage and fee limits, and if it’s really not working, I turn off the computer and go for a walk, then come back and try again.