emqx4.3/changes/ce/feat-12251.en.md

Optimize performance of the RocksDB-based persistent session. Reduce RAM usage and frequency of database requests.

• Introduce dirty session state to avoid frequent mria transactions
• Introduce an intermediate buffer for the persistent messages
• Use separate tracks of PacketIds for QoS1 and QoS2 messages
• Limit the number of continuous ranges of inflight messages to one per stream