Why Your Website Needs to Be Faster Than Your Competitors

Picture this: a potential client clicks on your website. The page loads. A banner jumps down. The button they were about to tap disappears behind an ad element. They click the wrong link. Frustration. Bounce.

That is exactly what Google measures with Core Web Vitals. And that is exactly why search engines penalise slow, unstable websites with lower rankings. Three metrics you should know – and what you can do about each of them.

LCP: How Quickly Does the Most Important Content Appear?

Largest Contentful Paint (LCP) measures how long it takes for the largest visible element on a page to fully load. Most often, this is a hero image, a large banner or a main headline.

Google’s target: under 2.5 seconds.

Why this matters: users decide in milliseconds whether to stay or leave. A page that takes three or four seconds to show its main content loses a meaningful share of visitors before they have seen anything at all.

Common causes of poor LCP:

  • Images delivered in outdated formats without optimisation
  • No caching or content delivery network (CDN) in use
  • Large resources blocking page rendering

What helps:

  • Deliver images in modern WebP or AVIF formats
  • Preload critical resources (<link rel="preload">)
  • Reduce server response times through hosting optimisation

INP: Does Your Website Respond to Clicks?

Interaction to Next Paint (INP) has been the Core Web Vital for responsiveness since March 2024, replacing FID. It measures how quickly your website responds to all user interactions – not just the very first one.

Google’s target: under 200 milliseconds.

This sounds abstract – but it is not. When someone clicks a button and the page takes half a second to respond, it feels sluggish. On mobile devices with weaker connections, the effect is even more noticeable.

Common causes of poor INP:

  • Heavy JavaScript blocking the main thread
  • Too many third-party scripts (tracking, chat widgets, ad scripts)
  • Poorly structured event listeners

What helps:

  • Reduce JavaScript execution to what is strictly necessary
  • Split code – load only what is currently needed
  • Load third-party scripts asynchronously or with a delay

CLS: Does Your Page Jump Around While Loading?

Cumulative Layout Shift (CLS) measures how much page content shifts while loading. An article that jumps downward because an ad banner loads after – that is CLS. A form that shifts sideways when a sidebar element appears – also CLS.

Google’s target: below 0.1.

CLS is not just an SEO problem. It is a trust and usability problem. A page that moves while loading feels unfinished. It also causes unintended clicks – which frustrates users and damages your credibility.

Common causes of poor CLS:

  • Images and videos without defined width and height in HTML
  • Dynamically embedded content without reserved space
  • Web fonts that cause layout shifts after loading (FOUT or FOIT)

What helps:

  • Give all images and videos explicit width and height attributes in HTML
  • Reserve space in the layout for dynamic content before it loads
  • Use font-display: optional or preload web fonts early

How to Measure Your Core Web Vitals

Google provides two free tools:

PageSpeed Insights gives you immediate LCP, INP and CLS scores for any URL – broken down by mobile and desktop. It shows both lab data and real-world field data from the Chrome User Experience Report (CrUX).

Google Search Console shows your aggregated Core Web Vitals data across your entire website over time. It reveals which groups of URLs have problems, so you can prioritise effectively.

Important: always pay attention to field data from real users. Lab data is useful for diagnosis, but your actual visitors’ experience is what determines your ranking.

Static Websites: A Built-In Advantage

Statically generated websites consistently achieve better Core Web Vitals than CMS-based solutions. The reason: no server-side rendering, no plugin overhead, no WordPress PHP stack.

Pages are delivered as finished HTML. The result: faster load times, fewer JavaScript bottlenecks, more stable layouts. For SMEs planning a new website, this is a serious argument for modern static web technology.

Conclusion: Technical Quality Is Customer Service

Core Web Vitals are not a purely technical SEO concern. They measure how respectfully you treat your website visitors’ time and attention. A fast, stable website is customer service – and a ranking factor.

Want to know how your website currently performs? Get your free PageSpeed review.

This article was written by Blue Ocean Marketing – your agency for static websites, performance marketing and GEO optimisation. We help startups and SMEs become digitally visible.