快速 focuses on how fast a user sees the main content, and Google demands that this time needs to be kept within 2.5 seconds. To solve this issue, webmasters must compress massive hero images, enable aggressive caching. Meanwhile, CLS measures the visual stability of the page. Users absolutely hate when you are trying to read a paragraph, and an ad suddenly loads at the top, making you misclick an ad. This garbage UX leads directly to algorithmic penalties.
To sum up, improving these page experience metrics has ceased to be solely the responsibility of frontend developers; it represents an absolute survival baseline that every site owner must master.
