When running a testnet against Tendermint v0.35, the Vega team observed that enabling the new priority mempool feature triggered unexpected memory growth in their nodes as compared to using the legacy (sequential) mempool on a similar workload. In summary, a validator with a 10K mempool with a 2K cache shows moderate growth on a resident heap of between 500MiB and 1GiB using the sequential mempool, but quickly rose to 3GiB (which ran over cap and terminated the process) when using the priority mempool.