How to read Chrome Timeline?
问题 Google Chrome browser has a Timeline tab in the developer panel which shows how long it takes to render a page. But I do not understand why it shows 17s while the page completes rendering within 4s. The start and end points of the measurement seems to be off. Is there an explanation of this measurement behavior? 来源： https://stackoverflow.com/questions/23961458/how-to-read-chrome-timeline