如何保持系统的响应速度和吞吐量？

在物联网场景中，设备数量众多且数据产生频繁，Apache IoTDB需要能够处理高并发的数据写入和查询请求。在高负载情况下，如何保持系统的响应速度和吞吐量？请问有什么方案可以优化呢？

The issue names no files, tests, or entry points; start by reviewing IoTDB's existing high-load write and query documentation, configuration guidance, and performance benchmarks. Done would require a clearly scoped, actionable optimization guide or identified change, with measurable response-time and throughput expectations.

Written by the indexing model from the issue text.