Nexura DigitalAI · Automation · Marketing
Nexura Digital service

Core Web Vitals optimization and site speed, measured before and after

A slow site frustrates visitors and shows up in the data Google collects from real users. We measure, fix what matters most and compare with the same metrics.

Core Web Vitals are three Google metrics for real-world loading, responsiveness and visual stability: LCP, INP and CLS. Nexura Digital measures your site with field and lab data, fixes the biggest causes and compares before and after, working remotely with businesses whose websites, stores or landing pages are slow. You can start with a 7-day trial on your most important template.

Thresholds and how they are measured

Google's thresholds

They are assessed at the 75th percentile of real visits, separately for mobile and desktop.

  • LCP, loading of the main content: good at 2.5 s or less
  • INP, response to clicks, taps and key presses: good at 200 ms or less; it replaced FID in March 2024
  • CLS, visual stability: good at 0.1 or less

Lab data

Lighthouse, Chrome DevTools or WebPageTest load the page under simulated, repeatable conditions: ideal for diagnosing issues and checking a fix right away. A simulated page load has no real interactions, so it can't measure INP and uses Total Blocking Time (TBT) as a proxy.

Field data

Data from real Chrome users in the CrUX report, shown in PageSpeed Insights and Search Console. It is what Google uses and covers 28 days, so an improvement takes weeks to show fully.

What we fix for each metric

LCP

  • Main image in AVIF or WebP, correctly sized and with high fetch priority
  • No lazy loading on what appears first
  • A faster server: caching, a CDN or better hosting

INP

  • Long JavaScript tasks split up and non-essential code deferred
  • Third-party scripts reviewed: chat widgets, maps, pixels and piled-up tags
  • A lighter DOM on very heavy pages

CLS

  • Space reserved for images, videos, ads and iframes
  • A cookie banner that doesn't push content around
  • Web fonts that load without layout shifts

Our method

Measure, fix, measure again

  • Baseline per template: home, service, category, product
  • Diagnosis of the cause behind each failing metric
  • Fixes ranked by impact and effort, tested before release
  • Lab verification after every change
  • Field tracking over 28 days and validation in Search Console

When it's worth it and when it isn't

It's worth it if

  • Search Console flags URLs as poor or needing improvement
  • You pay for ads and the landing page loads slowly on mobile
  • Your store is slow on product pages or in the cart

It's not the priority if

  • Your field metrics are already good and the problem is content
  • You expect to climb rankings on speed alone: relevance matters more
  • You are rebuilding the site soon: build performance into the new project

Results you can check

Reports and changes

  • A baseline report per template, with field and lab data
  • Causes prioritized by metric
  • Fixes implemented and documented
  • A comparison: lab at handover, field after 28 days
  • Page weight and script limits to keep the gains

7-day trial: one key template

One template, measured and fixed

We choose a key template with you, such as the product page or your ad landing page, fix the main cause of its worst metric and confirm the improvement in the lab. The field comparison, which needs 28 days, is scheduled for later. Scope and terms are agreed in writing before we start.

FAQ

Frequently asked questions

Why does PageSpeed Insights give me a different score every time?

The score comes from a Lighthouse lab test and varies with server load, network conditions and third-party scripts at that moment. That's why we don't use it as the goal: we repeat tests and compare medians, and we base decisions on field data from your real users.

Will better Core Web Vitals make me rank higher?

We can't promise that. Google uses Core Web Vitals in its ranking systems as part of page experience, but relevance and content quality matter more. What does change is the experience of the people visiting your site, and that can be measured: we compare metrics and conversions before and after.

What if my site has no CrUX data?

That is common on low-traffic sites. We install the web-vitals library, which measures LCP, INP and CLS on real visits, and send the data to GA4 through Google Tag Manager, respecting your cookie consent settings. That gives you your own field data even if Google publishes none for your domain.

Is my WordPress theme or page builder the problem?

Sometimes, but not always. Many problems come from piled-up plugins, unoptimized images, third-party scripts or a slow server, and can be fixed without changing themes. If the builder generates too much code, we show you the data and decide with you whether to optimize it or rebuild the key templates.

Contact

Is your site failing a Core Web Vital?

Check the Core Web Vitals report in Search Console, or send your domain to nexuradigital2026@gmail.com or to +34 603 636 249 on WhatsApp. We start with the template that matters most in the 7-day trial.

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