Question: Select all that apply. Which of the following are Core Web Vitals?
- Total Blocking Time
- First Input Delay
- First Contentful Paint
- Cumulative Layout Shift
Explanation
In HubSpot performance terminology, Core Web Vitals focus on loading, interactivity, and visual stability. The interactivity metric in this set is First Input Delay, and the visual stability metric is Cumulative Layout Shift. HubSpot’s site speed guidance identifies Cumulative Layout Shift as a key Web Vitals metric and treats these metrics as the core measures used to evaluate page experience. The remaining choices are useful performance measurements, but they are not part of the core set used in this question’s terminology. HubSpot+1
Why the other options are incorrect
Total Blocking Time is a diagnostic performance metric, not one of the Core Web Vitals. HubSpot Developers
First Contentful Paint measures when initial content first appears, but it is not part of the Core Web Vitals set used here. HubSpot+1
Source for verification
HubSpot Knowledge Base: Use the site speed dashboard. HubSpot
HubSpot Developer Documentation: Optimizing your HubSpot CMS site for speed. HubSpot Developers
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