CWA Website Performance Optimization & Reporting 2

Question 1

Which Core Web Vitals metric replaced First Input Delay (FID) in March 2024?

Accepted Answer

Interaction to Next Paint

Answer

Interaction to Next Paint (INP) replaced FID as the responsiveness Core Web Vital because it measures all interactions, not just the first.

Question 2

A page's LCP is 3.4 seconds at the 75th percentile of field data. How does Google classify it?

Accepted Answer

Needs improvement

Answer

LCP of 2.5s or less is good, 2.5-4.0s needs improvement, and over 4.0s is poor.

Question 3

Which CLS score is considered 'good' for Core Web Vitals?

Accepted Answer

0.1 or less

Answer

A Cumulative Layout Shift of 0.1 or less at the 75th percentile is rated good.

Question 4

Why is field data often preferred over lab data for judging real user experience?

Accepted Answer

It reflects real devices, networks, and user behavior

Answer

Field (RUM) data captures the variety of real devices and connections, whereas lab data is a controlled simulation.

Question 5

Which technique most directly reduces Largest Contentful Paint for a hero image?

Accepted Answer

Preloading the hero image and using a modern format

Answer

Preloading the LCP resource and serving compressed formats like WebP/AVIF speeds up its render.

CWA - Certified Web Analyst Practice Test