So the subtraction of user input time from total time, namely the "real execution time", can truly reflect the user-perceived performance.
此时程序的“实际执行时间”，即整体执行时间与等待用户响应时间之差，才能够真实地反映用户可察觉的系统处理能力。
Because of these features, the performance that is measured by a testing tool can differ from the performance that is perceived by the user.
由于这些特性的存在，测试工具测试的性能不同于用户预期的性能。
The router can lazily preload modules after the app starts and before the user navigates to them for improved perceived performance.
路由器可以在应用启动之后和用户导航到惰性加载模块之前，预先加载惰性模块，以增强性能。
The entire process happens in fractions of a second and so has practically no impact on either the user experience or perceived performance.
整个过程发生在很短的时间内，因此几乎不会对用户体验或性能造成实际影响。
While the merge options do not always have a major impact on overall query performance, they can impact perceived performance because they control how long a user must wait to see results.
尽管合并选项并不总是对总体查询性能有很大影响，但是，由于它们控制用户必须等待多长时间才能看到结果，因此可能会对感觉到的性能产生影响。
While the merge options do not always have a major impact on overall query performance, they can impact perceived performance because they control how long a user must wait to see results.
尽管合并选项并不总是对总体查询性能有很大影响，但是，由于它们控制用户必须等待多长时间才能看到结果，因此可能会对感觉到的性能产生影响。
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