Before the browser can render the page, it needs to construct the:

  • DOM and CSSOM trees
  • UX trees
  • HTML and JavaScript
  • Pixel pipeline

Explanation: Before the browser can render the page, it needs to construct the DOM and CSSOM trees. As a result, we need to ensure that we deliver both the HTML and CSS to the browser as quickly as possible.

Read more here: https://support.google.com/partners/answer/7336282

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