Just paid my tuition again: one swap clearly looks "about the same," but the transaction price just flies away, and only afterward do I realize the pool depth is as thin as paper. I also raised the slippage to make it easier... Basically, I was too hasty with my order. Reflecting later: don’t go all in at once, split into several trades, wait for one or two big orders to finish before entering, a slower pace actually results in fewer hits. Now L2s are arguing every day about TPS/fees/subsidies, I just want to say, no matter how fast the chain is, if you treat slippage as air and open it, you'll still lose instantly. Forget it, I won’t chase explanations anymore; some randomness is just randomness, but what can be controlled, should be controlled: first check the depth, then decide your speed.