The verdict in three sentences
For a B2B website in Berlin, a Core Web Vitals audit costs between 2,000 and 6,000 EUR (net of VAT) in 2026, and fixes between 3,000 and 15,000 EUR depending on accumulated technical debt. The thresholds are known: LCP under 2.5 s, INP under 200 ms, CLS under 0.1, measured on real user data, not just in the lab. Performance is one ranking factor among many: it will not rescue a site without content, but a slow site loses ground to an equally relevant competitor.
The three metrics and what they reveal on an industrial site
Websites of engineering suppliers and industrial subcontractors share the same flaws: process videos on the homepage, uncompressed factory image carousels, heavy ISO and EN 9100 certificate PDFs, and themes loaded with unused plugins. The average B2B page weighs 2.4 MB in 2026, while a well-optimised page stays under 1 MB.
| Metric | "Good" threshold | Common value on an industrial site | Typical cause |
|---|---|---|---|
| LCP (largest element render) | 2.5 s | 3.5 to 5 s on mobile | Unoptimised hero image or video |
| INP (interaction responsiveness) | 200 ms | 250 to 450 ms | Third-party scripts, chat, overloaded tag manager |
| CLS (visual stability) | 0.1 | 0.15 to 0.3 | Cookie banner, fonts, images without dimensions |
| Page weight | Under 1 MB targeted | 2.4 MB on average | JPEGs not converted to WebP or AVIF |
| Network requests | Under 60 | 90 to 150 | Stacked plugins and widgets |
| TTFB (server response) | Under 800 ms | 900 ms to 1.5 s | Shared hosting without caching |
With 25% of traffic on mobile, buyers checking your site from a trade fair or a shop floor get the worst version. Google evaluates the mobile version first for indexing.
2026 cost: audit, fixes and monitoring
These ranges are 2026 orders of magnitude for freelancers and agencies in Berlin. They are not a Kolonell offer.
| Service | Scope | 2026 budget (net) | Timeline |
|---|---|---|---|
| Express audit | Field data analysis, 10 key pages, prioritised report | 2,000 to 3,500 EUR | 1 week |
| Full audit | All templates, third-party scripts, server, costed action plan | 3,500 to 6,000 EUR | 2 to 3 weeks |
| Light fixes | Images, fonts, caching, cookie banner (often a GDPR-compliant consent tool) | 3,000 to 5,000 EUR | 2 to 3 weeks |
| Medium fixes | Plugin clean-up, deferred loading, CDN | 5,000 to 9,000 EUR | 3 to 6 weeks |
| Theme rebuild | Front-end rewrite, technical debt removal | 9,000 to 15,000 EUR | 6 to 10 weeks |
| Monthly monitoring | Metric tracking, regression alerts | 250 to 700 EUR per month | Ongoing |
Beyond 15,000 EUR of fixes, a full rebuild is often more rational than patching. The audit should settle that question with a side-by-side cost estimate.
Realistic SEO impact: what to expect
Core Web Vitals are a page experience signal, alongside HTTPS and the absence of intrusive interstitials. On a competitive query such as "CNC machining Berlin", turning green will not lift you ten places on its own. A fast site does, however, improve bounce rate, pages per visit and quote request rate, which matter more for revenue. Field data updates over a rolling 28-day window: allow 4 to 8 weeks after fixes to see the effect in Search Console.
For companies that want ongoing SEO support after the fixes, Kolonell's monthly plans are listed on the SEO services page: Essentiel 100,000 FCFA, Growth 200,000 FCFA and Premium 350,000 FCFA a month (about 150, 300 and 530 EUR).
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Mini case study
Jonas, marketing manager at a 140-employee precision engineering supplier in Berlin, sees a mobile LCP of 4.2 s and an INP of 380 ms. His site gets 6,000 visits a month and 30 quote requests, a 0.5% rate. After a 4,000 EUR audit and 7,000 EUR of fixes, the assumption is a quote rate rising to 0.65%, or 39 requests a month. If one request in ten becomes an average 25,000 EUR contract, the 9 extra requests represent about 22,500 EUR of additional monthly revenue. The 11,000 EUR budget is covered by the first contract signed, a projection to confirm over six months of real data.
FAQ
What is the difference between lab data and field data?
Lab data (Lighthouse) simulates a device, while field data comes from real visitors over 28 days. Google ranks on field data, so a Lighthouse score of 95 does not guarantee an INP under 200 ms.
Why did INP replace FID?
Since March 2024, INP measures responsiveness across all interactions in a visit, not just the first one. It is stricter: roughly 30% of sites that passed FID fail INP.
Should I change hosting?
If TTFB exceeds 800 ms, usually yes. Hosting with caching and a CDN costs 30 to 150 EUR a month and often solves half of the LCP problem.
How long before I see an SEO effect?
Allow 4 to 8 weeks for field data to turn green, then 2 to 3 months to measure ranking changes. Conversion gains show from the first month.
Let's scope your project. Send us your site URL and read access to Search Console, and we will price the audit, the indicative fix budget and the timeline. 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.
