The Evolution of Performance Metrics
When Google introduced Core Web Vitals in 2020, they fundamentally changed how we measure and optimize web performance. Five years later, these metrics have evolved to reflect the changing nature of web applications and user expectations.
In this article, we'll explore the performance metrics that matter most in 2025 and how they impact both user experience and search rankings.
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Core Web Vitals in 2025
The original Core Web Vitals—LCP, FID, and CLS—have been refined and expanded to better measure the performance of modern web applications:
- Largest Contentful Paint (LCP) now considers viewport-specific content priority
- First Input Delay (FID) has been replaced by Interaction to Next Paint (INP)
- Cumulative Layout Shift (CLS) now accounts for intentional layout shifts triggered by user interactions
- Time to First Byte (TTFB) has been added as a core metric to measure server response time
