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补充下 Google Developers 社区对该主题的介绍:https://developers.google.com/web/fundamentals/performance/critical-rendering-path

![8847F94C-7D69-46FC-B356-CE9920A63DD0](https://user-images.githubusercontent.com/6443913/75944979-fb924900-5ed3-11ea-9a9d-fbfa5aa25b48.png) ![6D06B600-029A-4524-9C19-B260F83AEF31](https://user-images.githubusercontent.com/6443913/75944982-fdf4a300-5ed3-11ea-8ea1-a96e93abf6f4.png) ![7649FC5D-BA74-48A7-90CF-86D949CBF992](https://user-images.githubusercontent.com/6443913/75944987-ffbe6680-5ed3-11ea-9768-0c876c476119.jpeg)