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Perceived Performance

  1. People want to get started
  2. Boring feels slower
  3. Anxious waits feel slower
  4. Unexplained waits feel slower
  5. Uncertain waits feel slower
  6. People will wait for value
  • You must be at least 20% faster than your competitors for people to care.

Web Vitals

  • Are the 4 modern metrics that measure true performance
  1. FCP (First Contentful Paint)
  2. LCP (Largest Contentful Paint)
  3. CLS (Cumulative Layout Shift)
  4. FID (First Input Delay)

Lighthouse

  • Run LH in a separate tab
  • Make it simulate first experience: simulate throttling, clear storage

Crux Comparison

https://crux-compare.netlify.app/

Performace Web API

https://developer.mozilla.org/en-US/docs/Web/API/Performance