Performance bank Core Web Vitals Performance / 6 questions Your progress 0 / 6 done Saved in this browser. Reset All 6 Medium 5 Hard 1 Hide done No questions match those filters. 1 What are LCP, INP, and CLS, and what does each measure? Medium 2 What are 'good' thresholds for the Core Web Vitals, and why percentiles (p75) not averages? Medium 3 What are the biggest causes of a slow LCP, and how do you fix each? Medium 4 What causes layout shift (CLS), and how do you reserve space to prevent it? Medium 5 What replaced First Input Delay with INP, and why is INP harder to fix? Hard 6 What's the difference between lab data (Lighthouse) and field data (CrUX/RUM)? Medium Next → Loading Performance