性能的指标，与功能等其他特性指标一样，是被定义出来，绝不是被测试出来。/Metrics of performance, as the same as functional features, all of these are by defined but not by test.

    测试即度量，其仅是对指标予以确认和定性，给定出特定的结果而已。/Test is just measure, for offering specific results to confirm for these metrics.

    性能的优化结果，或者是时间换空间，或者是空间换时间

    当我们计划开展性能测试前，有以下问题需要被明确/What should be confirmed before we planning for performance test：

    • 当前的性能问题的具体表现是什么/specific problems of performance for now
    • 最迫切要解决的性能问题是什么/what are the most urgent problems
    • 达成的性能指标是多少/how about the metrics of goals are
    • 性能指标达成后，有没有业务运营指标或产品特性承载，或技术架构指标，以表明性能结果确实达成/what the metrics for indicating test results achievement are, such as metrics of businesses, new features, technical metrics, DAU, etc.