Glossary

FID (First Input Delay)

A deprecated Core Web Vital that measured the time from first user interaction to when the browser could respond.

What is FID (First Input Delay)?

First Input Delay (FID) measured the time from when a user first interacts with a page to when the browser could respond. It was replaced by INP as a Core Web Vital in March 2024.

Performance Thresholds

  • Good: < 100ms
  • Needs Improvement: 100ms - 300ms
  • Poor: > 300ms

Key Takeaways

  • 1.FID (First Input Delay) is important for website performance and SEO.
  • 2.You can measure it using tools like BulkAudit and Google Lighthouse.
  • 3.Improving this metric can lead to better user experience and search rankings.

Learn More

Google Web Fundamentals

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