为了找到性能瓶颈，必须了解在为最终用户请求服务的过程中应用程序所交互的软件花费的时间。
In order to identify any performance bottlenecks, it is important to know the time spent by software that the application is interacting with while servicing an end-user request.
而且，因为免费，它能节省一大把的零钱，同时节约了不得不掌握数种跟踪软件花费的时间。
Moreover, being free, it saves a chunk of change, and spares him from having to master a bunch of different tracking tools.
构建任何相当复杂的软件应用程序都会花费时间，从几分钟到几小时。
Building any reasonably complex software application can take time, from several minutes to several hours.
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