Add perf-topic.

Author: Jiu-xiao

docs/perf/perf-topic.md

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+---
+id: perf-topic
+title: 消息系统性能测试
+sidebar_position: 3
+---
+
+# 消息系统性能测试
+
+LibXR在没有RT补丁的Linux环境下能够做到亚微秒级别的通信延迟，同时内置的FastCopy在较大数据量（例如图片）的传输中能够表现出明显优于std::memcpy的性能。具体测试数据与代码请参考[此仓库](https://github.com/Jiu-xiao/FuckingRosLatency)。

i18n/en/docusaurus-plugin-content-docs/current/perf/perf-topic.md

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+---
+id: perf-topic
+title: Messaging System Performance Tests
+sidebar_position: 3
+---
+
+# Messaging System Performance Tests
+
+LibXR can achieve sub-microsecond communication latency on a non-RT-patched Linux system. Its built-in FastCopy also delivers noticeably better performance than `std::memcpy` when transferring larger data payloads (such as images).  
+For detailed test data and code, please refer to [this repository](https://github.com/Jiu-xiao/FuckingRosLatency/blob/master/README_en.md).