What is session serialization in OpenClaw?

By default, OpenClaw processes messages within a single session one at a time, in order, rather than handling multiple messages from the same conversation simultaneously.

• Prevents a session's state from being corrupted by two messages being processed concurrently and racing against each other
• Doesn't limit overall throughput as much as it might sound, since separate sessions still run in parallel with each other
• Matters when benchmarking OpenClaw, since testing needs to account for both per-session serialization and cross-session concurrency

This default reflects a reasonable trade-off: consistency within a single ongoing conversation, without sacrificing the ability to serve many different conversations at once.

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