I tried once during the rush hour to forcibly make a swap, just to see what it feels like to be queued in the mempool. The result was: you think clicking submit is enough, but in reality, your transaction is being pushed around among a bunch of "pending" transactions, and others can insert themselves by adding small tips. If you don't add tips, your transaction stays hanging, and during that time, price slippage and routing changes can mess you up. The most embarrassing part is waiting for a long time only to finally fail, wasting a failed fee... Honestly, it's like queuing at a station, and the line can be rearranged by scalpers. Recently, the "compound yield on yield" staking system has been criticized as a copycat, and it looks pretty similar to that: the bottom layer is solid, but stacking more layers just causes everything to get stuck together. Anyway, in the future, I’d rather do it in batches, set good slippage, or simply wait until the chain isn't congested before taking action.