docs: Add performance data to README

Author: duanyangjing

README.md

@@ -23,6 +23,19 @@ Higher version of JVM brings enhancements in garbage colleciton, JIT, etc.
 + Enhanced JIT compiler, support more intrinsics with faster implementation
 + Drop-in replacement for existing JDK, easy to upgrade and rollback
 
+## Performance Results
+
+CVM has been throughly tested on various application scenarios, including Java Microbenchmark Harness (JMH),
+SPECjbb2015, Flink nexmark, etc. Compared to jdk8u372, some of the performance results are as follows:
+
+| Application | Performance Improvement |
+| ----------- | ----------------------- |
+| JMH java.util all cases average           | 30% |
+| JMH java.util.stream all cases average    | 45% |
+| SPECjbb2015 critical-jOPS                 | 90% |
+| SPECjbb2015 max-jOPS                      | 5%  |
+| Flink nexmark all queries average         | 10% |
+
 ## Using CVM
 
 ### Option 1: Download and install

README_cn.md

@@ -14,6 +14,19 @@ CVM的主要特性如下：
 + 性能更高的 JIT 编译器，包括更全面的intrinsic支持和高性能的实现
 + 可直接替换现有 JDK8 使用，升级过程简单可控
 
+## 性能数据
+
+CVM已经在多种应用场景上进行功能和性能测试，包括JMH, SPECjbb2015, Flink nexmark等。与jdk8u372相比,
+一些性能数据如下：
+
+| 应用场景 | 性能提升 |
+| -------- | -------- |
+| JMH java.util 所有case平均          | 30% |
+| JMH java.util.stream 所有case平均   | 45% |
+| SPECjbb2015 critical-jOPS           | 90% |
+| SPECjbb2015 max-jOPS                | 5%  |
+| Flink nexmark 所有query平均         | 10% |
+
 ## 如何使用
 
 ### 选项一：下载安装