Welcoming core web vitals to page-speed

05 Jul 2020

Google has added core web vitals to Page speed scoring, a convenient and consistent system to understand the performance of your webpage. 

According to Google,


Core Web Vitals are the subset of Web Vitals that apply to all web pages.. Each of the Core Web Vitals represents a distinct facet of the user experience, is measurable in the field, and reflects the real-world experience of a critical user-centric outcome.


At Raileo, we have also adapted to the core web vitals and your page-speed reports will contain these new metrics. Below are more details of the core web vitals. 


  1. Largest Contentful Paint (LCP): This measures loading performance, how long the largest piece of content (image, text, etc..) takes to appear on the screen. If LCP is less than 2.5 seconds, you're golden.
  2. First Input Delay (FID): This measures interactivity How long does it take the webpage to respond to first user interaction determine FID. Webpages should have an FID of less than 100 milliseconds.
  3. Cumulative Layout Shift (CLS): This measures visual stability. To provide the best user experience, elements in your webpage should not move around hence not interactable for users. Ideally, pages should maintain a CLS of less than 0.1.


For the new page-speed reports, you will see these new core vitals integrated into Raileo. 


With the latest changes, 2 other metrics have been removed to pave the way for a better scoring system. 

  1. FMP(First meaningful Paint) is deprecated. You can refer to LCP instead of this deprecated metric
  2. First CPU Idle (FCI) is deprecated and you can refer to TTI (Time to Interactive) instead.

Above mentioned 2 deprecated metrics have been removed from the Page-speed reports in Raileo


That's it for now, Cheers :)

Would you like to test how these metrics works for your website? Try our free pagespeed tool here


Illustration from Freepik