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How Web Performance Affects Business Results (Case Studies)

Amazon sees a 1% decrease in revenue for every 100ms increase in load time.

Glossary

The Core Web Vitals are:

  • Largest Contentful Paint (LCP): measures the time in seconds from when the page starts loading to when the largest text block or image element is rendered on the screen.
  • First Input Delay (FID): measures the time in milliseconds from when a user first interacts with your site to when the browser is able to respond to that interaction.
  • Cumulative Layout Shift (CLS): measures the cumulative score of all unexpected layout shifts within the viewport that occur during a page’s entire lifecycle.

And the non-Core Web Vitals are:

  • Total Blocking Time (TBT): measures the total time in milliseconds between First Contentful Paint (FCP) and Time To Interactive (TTI) where the main thread is blocked long enough to make it unresponsive to user input.
  • First Contentful Paint (FCP): measures the time from when a page starts loading to when any part of that page’s content is rendered on the screen.
  • Speed Index (SI): measures how quickly the contents of a page are visibly populated during page load.
  • Time to Interactive (TTI): measures the time from when the page starts loading to when it’s fully interactive.

Core Web Vitals are a ranking factor for Google Search as part of the new page experience signals. Additionally, it’s always important to provide users with a good experience on your site.


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