Core Web Vitals still matter in 2026—for SEO signals and for whether buyers trust your site enough to inquire. This checklist is for business and marketing sites (not only e-commerce megasites): what to measure, what to fix first, and what to ignore.
The three metrics (plain English)
| Metric | What it feels like | Rough “good” target |
|---|---|---|
| LCP | How fast the main content appears | ≤ 2.5s |
| INP | How snappy clicks/taps feel | ≤ 200ms |
| CLS | Whether the layout jumps | ≤ 0.1 |
Use PageSpeed Insights and Search Console field data when available. Lab scores help debug; field data reflects real users.
LCP checklist
- Hero image is optimized (modern format, right size, priority/preload if needed)
- No giant unoptimized hero video by default
- Critical CSS isn’t blocked by huge unused stylesheets
- Fonts don’t delay text forever (subset,
font-display) - Hosting/CDN is close to your audience
Related build choices: headless vs traditional commerce when storefront weight is the issue.
INP checklist
- Heavy JS isn’t on every page “just in case”
- Third-party scripts (chat, tags, embeds) are deferred or limited
- Buttons don’t wait on long main-thread work
- Avoid layout thrash from huge client-only widgets on first paint
CLS checklist
- Images and embeds have width/height (or aspect-ratio) reserved
- Ads/banners don’t shove content after load
- Web fonts don’t swap in a way that reflows headlines dramatically
- Sticky bars don’t appear late and push the page
Business-site priorities (order that usually wins)
- Fix the homepage and money pages (services, contact, key landing pages)
- Kill or defer the worst third-party scripts
- Compress and correctly size images
- Then chase micro-optimizations
A beautiful portfolio that scores 40 on mobile because of unoptimized media is leaving leads on the table. See also our website design work.
What Core Web Vitals won’t fix alone
Weak offers, thin content, and broken trust signals still lose deals. Performance is a multiplier—not a substitute for clear positioning.
How EG Stars ships performance
We treat performance as part of delivery—not a post-launch apology—especially for marketing sites and storefronts that need to convert.
Summary
- Track LCP, INP, CLS with field data when you can.
- Fix images, third parties, and layout stability first.
- Prioritize pages that make money.
Want a performance pass on your site? Get in touch.