Core Web Vitals Explained for Irish Business Owners

By Ceol Digital Team · Technical SEO · 8 min read

In 2021, Google introduced Core Web Vitals as direct ranking factors — meaning the performance of your website now directly affects where you appear in search results. If your Irish business website is slow or unstable, Google is actively penalising your rankings right now.

The Three Core Web Vitals

LCP — Largest Contentful Paint

LCP measures how long it takes for the largest visible content element on your page to load — usually your hero image or main heading. Target: under 2.5 seconds. The most common causes of LCP failure for Irish websites are slow hosting (cheap shared servers), unoptimised images and render-blocking JavaScript.

INP — Interaction to Next Paint

INP measures how quickly your page responds to user input — a click, tap or keypress. Target: under 200 milliseconds. Heavy JavaScript from plugins, analytics and chat widgets is the most common cause of INP failure on Irish WordPress and Shopify sites.

CLS — Cumulative Layout Shift

CLS measures how much your page visually shifts while loading — the experience of content jumping around as images load or ads appear. Target: under 0.1. Images without width and height attributes, and late-loading third-party embeds, are the most common causes.

How to Check Your Core Web Vitals

1. Go to pagespeed.web.dev and enter your URL
2. Check the Field Data section (real user data) not just Lab Data
3. Review your Google Search Console Core Web Vitals report for sitewide data
4. Note which metric is failing and on which device (mobile failures are more common)

Fixing Core Web Vitals on Irish WordPress Sites

• LCP: Upgrade hosting, compress images to WebP, defer non-critical JS, implement caching
• INP: Audit and remove heavy plugins, defer third-party scripts, reduce JS execution time
• CLS: Add width/height to all images, reserve space for ads and embeds, optimise font loading

→ Our Core Web Vitals Service