Core Web Vitals in practice: fast is a feature

Users don't care which framework you use; they care whether the page loads fast and feels smooth.

# Measure on real devices

Lab metrics are useful, but real-user data reflects the experience on slow networks and weak devices.

# Images and fonts are usual suspects

Optimizing image sizes, using modern formats, and loading fonts sensibly often yields the biggest wins.

• Reduce layout shift with fixed dimensions
• Defer non-critical scripts
• Prioritize above-the-fold content

Performance isn't a final phase — it's part of the design.