Site Speed and Core Web Vitals Optimization

A slow site costs you customers and slides down Google. We bring your site up to its LCP, INP and CLS targets and prove the result with a before/after measurement report. One-time $169 per site; all modern stacks including WordPress and Next.js.

The 3 Metrics Google Measures

Core Web Vitals are measurement, not guesswork: Google tracks the experience of real Chrome users (CrUX data) as a 28-day average and uses it as a ranking signal. We aim for the "good" threshold on all three metrics, and hold our own site to stricter limits: LCP under 2.0 seconds, CLS under 0.05.

LCP

Largest Contentful Paint

Good: under 2.5 seconds

Our target: under 2.0 seconds

How long the main content takes to appear on screen. The moment a visitor feels the site has loaded. Most common culprits: an unoptimized hero image, slow server response, render-blocking CSS.

INP

Interaction to Next Paint

Good: under 200 milliseconds

Our target: under 200 ms, on every interaction

How fast the page responds when you tap a button. Long JavaScript tasks and heavy third-party scripts ruin this metric. It replaced FID in 2024; any guide still optimizing for FID is out of date.

CLS

Cumulative Layout Shift

Good: under 0.1

Our target: under 0.05

Content jumping around while the page loads. An ad pushing the button away right as you tap it is this metric at work. Images without defined dimensions and late-loading fonts are the main causes.

What Does a Slow Site Cost You?

Visitor patience is measured in seconds. Most mobile users abandon a page that fails to load within 3 seconds; the visitor you paid ad budget to bring in leaves before ever seeing the page. Slowness also cuts conversions directly: the share of users who complete a form or finish checkout drops with every extra second.

On Google's side the impact works on two levels. Core Web Vitals are a direct ranking signal, and the rising bounce rate on a slow site tells Google "this result is not satisfying users." A site with strong content but poor speed can fall behind a fast competitor with mediocre content.

As an SEO agency, we treat speed not as decoration but as the load-bearing column of SEO work. That is why we carved this service out as a one-time package with a clearly defined scope.

Why Is Your Site Slow? The 7 Most Common Causes

  • 1Unoptimized images: photos served at original size, never converted to WebP/AVIF
  • 2Render-blocking CSS and JavaScript: unnecessary code loading before the content
  • 3Slow server response (TTFB): the wrong hosting choice or an infrastructure with no caching
  • 4Plugin bloat: 20+ WordPress plugins, each loading its own CSS/JS
  • 5Uncontrolled third-party scripts: analytics, marketing pixels, chat widgets
  • 6Font loading problems: invisible text (FOIT) or shifting text (FOUT)
  • 7No caching or CDN: everything sent from scratch to every single visitor

Most sites have 3-4 of these at the same time. Our job is not to fix everything, but to fix what the measurements say pays off most, first; optimizing outside the bottleneck is wasted time.

How We Work: Measure, Diagnose, Implement, Prove

1. Measure

We record the current state with PageSpeed Insights, Lighthouse and real-user CrUX data. Lab scores alone are misleading; we base decisions on 28 days of field data from real visitors. You receive the 'before' report in writing.

2. Diagnose

We examine the site in bottleneck order: which fix delivers the biggest win? Using a 40-item checklist, we work through the image, code, server, font and third-party layers one by one.

3. Implement

We convert images to WebP/AVIF, strip unused code, inline critical CSS, and set up lazy loading and caching. Changes are tested on a staging copy first; your live site stays intact.

4. Verify and Deliver

We run the final measurement with the same tools and hand over a before/after comparison report. Which metric moved from where to where, and what was done: all in writing. Measurements talk, not promises.

Speed Optimization Package

$169per site, excl. VAT, one-time

  • Before/after PageSpeed and Lighthouse report
  • Image optimization (WebP/AVIF conversion)
  • Unused CSS/JS cleanup
  • Critical CSS and font loading setup
  • Lazy loading and cache configuration
  • CDN recommendation and setup
  • Third-party script audit
  • Delivery in 5-10 business days

For large e-commerce sites and multilingual setups, scope is finalized in a call. If you want ongoing coverage, the monthly maintenance package ($99/mo) includes speed monitoring as well.

Request a Free Baseline Measurement

Frequently Asked Questions

What are Core Web Vitals?

Core Web Vitals are the three metrics Google uses to measure user experience: LCP (how long the main content takes to appear, good threshold under 2.5 s), INP (how fast the page responds to interaction, good threshold under 200 ms) and CLS (layout shift, good threshold under 0.1). Google measures them with data from real Chrome users (CrUX) and uses them as a ranking signal.

Does site speed really affect SEO?

Yes, in two ways: Core Web Vitals are a direct Google ranking signal, and a slow site drives visitors away, hurting indirect signals such as bounce rate and time on page. Most mobile users abandon a page that fails to load within 3 seconds. Speed alone will not put you in first place, but slowness drags every ranking down.

How long does speed optimization take?

For a standard business site, the measure + diagnose + implement + verify process takes 5-10 business days. Lab scores improve right away; because Google's real-user data (CrUX) is a 28-day average, the green result in Search Console settles within 4-6 weeks.

How do you guarantee the result?

We give you measurements instead of promises: a 'before' report when we start and an 'after' report at delivery, produced with the same tools (PageSpeed Insights, Lighthouse). Which metric moved from where to where is documented in writing. Our own site is our reference: the infrastructure serving this page runs with a 100/100 PageSpeed target, and we apply the same recipe.

I have a WordPress site. Can it be optimized?

Yes. On WordPress and WooCommerce sites the most common problems are plugin bloat, unoptimized images and missing caching; most are fixed without changing the theme. We also work with Next.js and other modern stacks. Whatever your platform, the process is the same: measure, diagnose, implement, verify.

Will I need to change my hosting?

Not always. We first measure your current server's response time (TTFB). If the problem sits in the code and image layers, it gets fixed without touching your hosting. If the server really is slow, we recommend an alternative that fits your budget, with the reasoning laid out in the report; the decision and approval stay with you.

Consider Alongside This Service

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