The Ultimate Guide to Core Web Vitals
Everything you need to know about Core Web Vitals, why they matter for your site, and how Jet helps you ace every metric.
What are core web vitals?
Core Web Vitals are Google’s key metrics for user experience. They measure how quickly your site loads, how soon it becomes interactive, and how stable the layout is as content appears. These three metrics are now critical ranking factors for search engines and a direct reflection of your visitors’ satisfaction.
Largest Contentful Paint (LCP): Loading performance
First Input Delay (FID): Interactivity
Cumulative Layout Shift (CLS): Visual stability
Optimizing for Core Web Vitals isn’t just about SEO—it’s about delivering a world-class experience.
Why do Core Web Vitals matter?
A site that excels in Core Web Vitals feels instant and smooth for every user. If your LCP is slow, visitors see a blank or incomplete page. If your FID is high, clicks and taps feel laggy. If CLS is poor, buttons and images jump around, causing frustration and accidental taps. Meeting these benchmarks means your site is fast, interactive, and visually stable—qualities that keep users engaged and coming back.
Core web vitals table
Metric | Good | Need Improvement | Poor |
|---|---|---|---|
LCP | ≤ 2,5 s | 2,5–4 s | > 4 s |
FID | ≤ 100 ms | 100–300 ms | > 300 ms |
CLS | ≤ 0,1 | 0,1–0,25 | > 0,25 |
Actionable tips for better web vitals
Improving your Core Web Vitals doesn’t have to be complicated. Here are a few proven strategies that can make a big difference:
Preload important images and fonts to speed up LCP.
Minimize third-party scripts and keep JavaScript lean for better FID.
Reserve space for images and ads to avoid unexpected layout shifts (better CLS).
Use a performance monitoring tool to track these metrics in real time.
Example: Optimizing LCP
How Jet helps
Jet automatically audits your site for these metrics and applies optimizations, so you can focus on content, not code. With Jet, you’ll always know where your site stands—and you’ll have the tools to reach and maintain top scores for a seamless, high-performing user experience.