Cluster Mempool1 is a complete reworking of how the mempool handles organizing and sorting transactions, conceptualized and implemented by Suhas Daftuar and Pieter Wuille. The design aims to simplify the overall architecture, better align transaction sorting logic with miner incentives, and improve security for second layer protocols. It was merged into Bitcoin Core in PR #336292 on November 25, 2025. 

The mempool is a giant set of pending transactions that your node has to keep track of for a number of reasons: fee estimation, transaction replacement validation, and block construction if you’re a miner. 

This is a lot of different goals for a single function of your node to…

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