Web Performance

Performance Metrics

  • First Contentful Paint
  • Speed Index
  • Speed Index
  • Time to Interactive
  • First Meaningful Paint
  • First CPU Idle
  • Max Potential First Input Delay

Lighthouse

WebPageTest

  • Load Time
  • TTFB
  • First Contentful Paint
  • Start Render
  • Speed Index
  • Total Blocking Time
  • Last Painted Hero

Page weight

TTFB

Start Render

Speed Index

Total Number of Requests

 

Perceived Performance 

 

 It’s a measure of how fast a user thinks your website is, not necessarily how fast your technical stats say it is

Guide

 
  • Audit your page
  • Use tools to find improvements
  • Introduce changes one by one
  • Audit after each change

Overall

 

Performance Tools are fine, they give you some hints but don't blindly trust them

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