如果你看到一个文件，得到改变每20 - 30秒左右，只是调查你的事件循环的变化，用一个定时器来确保你不太经常的调查。

If you're watching a single file that gets changed every 20-30 seconds or so, just poll for changes in your event loop, with a timer to make sure you don't poll too often.

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其基本方法是将循环工作分解到定时器序列中。

The basic approach is to split up the loop's work into a series of timers.

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如果你已经尝试了第四章介绍的循环优化技术，但还是不能缩减足够的运行时间，那么定时器就是你的下一个优化步骤。

If you've already tried the loop optimization techniques presented in Chapter 4 but haven't been able to reduce the execution time enough, then timers are your next optimization step.

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