The verdict in three sentences
A B2B site showing a mobile LCP of 4.8 s, an INP of 420 ms and a CLS of 0.27 fails all three Core Web Vitals and loses quote requests every week. Three options exist in 2026: an audit only (EUR 900 to 1,800 excl. VAT), a fixed-price remediation package (EUR 3,500 to 8,000) and a technical rebuild (from EUR 15,000). For a mid-sized services company in Amsterdam, the remediation package delivered in 3 to 6 weeks is enough in most cases and targets +12 to +25 % quote requests.
Where your site stands against Google's thresholds
Google assesses Core Web Vitals on the 75th percentile of real visits (CrUX data). A single metric above threshold is enough to classify the page as "needs improvement" or "poor".
| Metric | "Good" threshold | Your site | Most frequent cause |
|---|---|---|---|
| LCP (main content render) | 2.5 s | 4.8 s | 1.9 MB hero image, render-blocking font, slow server |
| INP (responsiveness) | 200 ms | 420 ms | Third-party scripts: chat, tag manager, maps |
| CLS (visual stability) | 0.1 | 0.27 | Cookie banner and images without dimensions |
| TTFB | 0.8 s | 1.6 s | Shared hosting without caching |
| Home page weight | Under 1.5 MB | 4.1 MB | Background video and carousel |
| Third-party requests | Under 15 | 42 | Marketing tools stacked since 2019 |
On a B2B site, INP is often the hardest: it depends on marketing tools added over the years. Each tracking script costs 20 to 80 ms of blocking on a mid-range phone.
Audit, package or rebuild: comparing the three options
| Criterion | Audit only | Remediation package | Technical rebuild |
|---|---|---|---|
| Price excl. VAT | EUR 900 to 1,800 | EUR 3,500 to 8,000 | EUR 15,000 and up |
| Timeline | 1 week | 3 to 6 weeks | 10 to 16 weeks |
| Deliverable | Prioritised report, 20 to 40 actions | Fixes deployed and measured | New technical foundation |
| Who fixes | Your current provider | The agency | The agency |
| Expected LCP gain | None without implementation | 4.8 s to 1.8 to 2.3 s | 4.8 s to 1.2 to 1.6 s |
| Expected INP gain | None without implementation | 420 to 150 to 190 ms | 420 to 80 to 120 ms |
| Suitable if | Internal tech team available | Healthy CMS, moderate debt | Outdated CMS, over 30 plugins |
The package is the right option if your CMS is up to date and the problems come from media, third-party scripts and hosting. A rebuild becomes rational when the theme itself loads more than 1 MB of JavaScript.
What a remediation package contains
| Action | Share of package | Main effect |
|---|---|---|
| Converting images to AVIF/WebP with explicit dimensions | 20 % | LCP and CLS |
| Preloading and self-hosting fonts | 10 % | LCP |
| Sorting and deferring third-party scripts | 25 % | INP |
| Server cache and CDN | 15 % | TTFB and LCP |
| Cookie banner without layout shift | 10 % | CLS |
| Removing carousel and background video | 10 % | Weight and LCP |
| Before/after measurement over 28 days | 10 % | Proof of result |
The EUR 150 monthly monitoring checks that new content and marketing tools do not cause a relapse, which happens in 4 cases out of 10 within 6 months without oversight.
Mini case study
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Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
Sarah, managing director of a mid-sized industrial maintenance services firm in Amsterdam, receives 60 quote requests a month through the site, with a 15 % close rate and an average contract margin of EUR 6,500. She chooses a package at EUR 5,800 plus EUR 150 per month. With a cautious 12 % increase, she gets 7 extra requests a month, roughly 1 extra contract, so about EUR 6,500 of additional monthly margin as an order of magnitude. The package pays back in the first month of results, and the annual monitoring cost (EUR 1,800) stays below a single contract.
FAQ
How much does Core Web Vitals remediation cost?
EUR 3,500 to 8,000 for a fixed-price package, after a EUR 900 to 1,800 audit often deducted from the package. A technical rebuild starts at EUR 15,000.
How soon are results visible?
Lab measurements change immediately, but Google field data is computed over a rolling 28 days. Allow 4 to 6 weeks after deployment for the Search Console report to turn green.
Do Core Web Vitals really win customers?
The ranking gain is moderate, but conversion improves clearly. On the B2B sites we monitor, quote requests rise between 12 and 25 %.
Do we need to remove our marketing tools?
Not necessarily. On average 60 % of scripts are kept, loaded after interaction or server-side, and duplicates are removed.
Why monthly monitoring?
Because 4 sites out of 10 relapse within 6 months after adding videos or tools. At EUR 150 per month, monitoring costs less than a new EUR 1,200 intervention.
Let's scope your project. Send us your site URL, we will measure your Core Web Vitals and price a package between EUR 3,500 and 8,000 delivered in 3 to 6 weeks. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
