今天来了个性能优化任务

首先，我阅读一下一些相关java performance tuning 的资料。
以下是要点：

Don’t make assumptions but measure
• Have quantified requirements, prove they are met or not
• Prove the architecture performs in a POC
• Continuously test performance during development
– to get a first impression
– for quick feedback on changes
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• Test representatively in a dedicated environment
– with production-like load
– on a production-like environment
– with production-like data
• Fix problems when found
• Prove the effect of each optimization
• Monitor the performance of your app in production