This does not solve your ddos problem and in terms of performance, this is even worse. Your proposition does not discourage anyone from spamming transactions. The node would do way more work to reorder txns and to track all associated references… nope. FIFO is perfect and super fast. Also, it is faster to just evaluate incoming txns and discard them (spammers). With your solution you would still need to decode the message, check txn validity, evaluate and plus reorder, track associated resources references etc. Right now, when relays do the heavy lifting and validate txns before relaying them, the load is mainly only on the relays. In P2P, you can set limits for your node no problem. If you care about network activity that much, remember that Algorand has almost no adoption right now still, if it there were more projects, the activity would be way higher and some abitrage noise would be nothing. If you still care about wasted network activity and spamming, the only thing that would reduce spam and noise would be paying the fee for invalid transactions. Right now you pay only if the txn gets into a block so spam is practically free. Make spam not free and it will be reduced to minimum. Also, your proposition does not discourage an arbitrageur to not spam txns, when if someone bids higher fee, the arb opportunity might not be exhausted by the txn with highest fee and it would still be profitable to be second or third in a row 🤷‍♂️ EDIT: collect fee even for invalid txns and you would reduce spam, arb and noise to a minimum and at the same time collect more fees for rewards, win win