Core Web Vitals are speed metrics 最佳加载速度

 Core Web Vitals are speed metrics that Google uses to measure user experience. 

These metrics include:

• Largest Contentful Paint (LCP) – Calculates the time a webpage takes to load its largest element for a user 
• First Input Delay (FID) – Measures the time it takes to react to a user's first interaction with a webpage.
• Cumulative Layout Shift (CLS) – Measures the shifts in layouts of various elements present on a webpage

To ensure your website is optimized for Core Web Vitals, you need to aim for the following scores:

• LCP –2.5 sec or lower
• FID – 100 ms or lower
• CLS – 0.1 or lower