Question: Select all that apply. What is First Input Delay?
- A measure of interactivity
- Another term for Time to Interactive
- A measure of loading performance
- A Core Web Vital
Explanation
First Input Delay is the interactivity-focused metric in the older Core Web Vitals set used in HubSpot’s official explanation of these metrics. HubSpot defines it as load responsiveness, which means it measures how quickly a page responds when a user first tries to interact with it. That makes it an interactivity metric rather than a loading or rendering metric. In the same HubSpot source, First Input Delay is listed as one of the three Core Web Vitals. HubSpot Blog
Why the other options are incorrect
Time to Interactive is a different performance concept, so it is not another name for First Input Delay. HubSpot Blog
loading performance is incorrect because HubSpot uses Largest Contentful Paint for perceived load speed, while First Input Delay is tied to responsiveness after the first interaction. HubSpot Blog+1
Source for verification
https://blog.hubspot.com/marketing/hubspot-core-web-vitals
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