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Core Web Vitals: the speed metrics that quietly cost you customers

9 March 2026 · 1 min read · Hubb Group

Key takeaways

Every slow second loses visitors — and Google uses speed as a ranking signal.
The three metrics that matter are LCP, INP and CLS.
Most failures come from images, third-party scripts and blocking fonts.

Every second a page takes to load, a slice of your visitors leave. Core Web Vitals put numbers on that pain — and Google uses them as a ranking signal — but the real cost is the customer who bounced before they ever saw your offer.

The three that matter

LCP — how fast the main content appears. Aim under 2.5s.
INP — how quickly the page responds when tapped.
CLS — how much the layout jumps around as it loads.

Most sites fail on images and third-party scripts: oversized hero images, a stack of marketing tags, and fonts that block rendering. Fixing those three usually moves the needle more than any redesign.

We build with this baked in — but it is worth auditing any site you already own. Slow is a leak, and leaks compound.

Frequently asked questions

What are good Core Web Vitals scores?

Aim for Largest Contentful Paint under 2.5 seconds, fast interaction response (INP), and minimal layout shift (CLS). Hitting the “good” thresholds helps both rankings and conversions.

Do Core Web Vitals affect SEO?

Yes — they’re a confirmed ranking signal. More importantly, they affect whether visitors stay, so improving them helps traffic and sales at once.

Can I fix Core Web Vitals without rebuilding my site?

Usually yes. Optimising images, deferring scripts and fixing render-blocking resources often moves a site from failing to passing without a redesign.

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