Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# 性能
+
+有一个 [native JSON benchmark collection][1] 项目，能评估 37 个 JSON 库在不同操作下的速度、內存用量及代码大小。
+
+[1]: https://github.com/miloyip/nativejson-benchmark
+
+RapidJSON 0.1 版本的性能测试文章位于 [这里](https://code.google.com/p/rapidjson/wiki/Performance).
+
+此外，你也可以参考以下这些第三方的评测。
+
+## 第三方评测
+
+* [Basic benchmarks for miscellaneous C++ JSON parsers and generators](https://github.com/mloskot/json_benchmark) by Mateusz Loskot (Jun 2013)
+ * [casablanca](https://casablanca.codeplex.com/)
+ * [json_spirit](https://github.com/cierelabs/json_spirit)
+ * [jsoncpp](http://jsoncpp.sourceforge.net/)
+ * [libjson](http://sourceforge.net/projects/libjson/)
+ * [rapidjson](https://github.com/Tencent/rapidjson/)
+ * [QJsonDocument](http://qt-project.org/doc/qt-5.0/qtcore/qjsondocument.html)
+ 
+* [JSON Parser Benchmarking](http://chadaustin.me/2013/01/json-parser-benchmarking/) by Chad Austin (Jan 2013)
+ * [sajson](https://github.com/chadaustin/sajson)
+ * [rapidjson](https://github.com/Tencent/rapidjson/)
+ * [vjson](https://code.google.com/p/vjson/)
+ * [YAJL](http://lloyd.github.com/yajl/)
+ * [Jansson](http://www.digip.org/jansson/)