To deliver the fastest possible time to first render, you should minimize the number of:

  • critical JavaScript functions
  • CSS classes
  • critical HTML classes
  • critical resources

Explanation:  To deliver the fastest possible time to first render, we need to minimize three variables:

  • The number of critical resources.
  • The critical path length.
  • The number of critical bytes.

A critical resource is a resource that could block initial rendering of the page. The fewer of these resources, the less work for the browser, the CPU, and other resources.
Read more herehttps://support.google.com/partners/answer/7336426[1234]

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