The verdict in three sentences
Core Web Vitals are not just an SEO criterion: a slow site loses conversions well before it loses rankings. In Berlin in 2026, a full audit costs EUR 900-2,500 and the optimization EUR 2,500-8,000, with a measurable return within 8 weeks. The classic mistake is paying for an audit without budgeting the fix: an audit with no work returns nothing.
What Core Web Vitals measure in 2026
Google assesses three main metrics. Here are the 2026 thresholds and the business impact observed when you exceed them.
| Metric | Good | Needs work | Poor | Impact beyond threshold |
|---|---|---|---|---|
| LCP (loading) | < 2.5s | 2.5-4s | > 4s | -7 to -15% conversion |
| INP (interactivity) | < 200ms | 200-500ms | > 500ms | -3 to -8% engagement |
| CLS (visual stability) | < 0.1 | 0.1-0.25 | > 0.25 | +5 to +12% bounce |
| TTFB (server) | < 0.8s | 0.8-1.8s | > 1.8s | drags LCP and crawl |
A 4.2s LCP, as in the sample case, puts the site in the red zone: usually a mix of unoptimized images, distant hosting and JavaScript-blocked rendering.
Cost of an audit and an optimization
| Service | 2026 price | Timeline | Deliverable |
|---|---|---|---|
| Express CWV audit (5-10 template pages) | EUR 900-1,400 | 3-5 d | Report + costed priorities |
| Full CWV audit (whole site) | EUR 1,500-2,500 | 5-10 d | Detailed report + roadmap |
| Image optimization (AVIF/WebP, srcset) | EUR 800-2,000 | 3-6 d | -40 to -70% image weight |
| Cache + lazy-load + preconnect | EUR 1,000-2,500 | 4-8 d | LCP -30 to -50% |
| Edge/CDN hosting rebuild | EUR 1,500-4,000 | 5-10 d | TTFB < 0.8s |
| JS optimization (code splitting, defer) | EUR 1,200-3,000 | 5-10 d | INP < 200ms |
A full project combines 3-4 of these lines. For a mid-sized B2B site, the realistic total is EUR 4,000-8,000, audit included.
Hosting comparison and monthly edge/CDN cost
TTFB depends directly on hosting. Here are the 2026 options for a mid-traffic B2B site.
| Hosting | 2026 monthly cost | Typical TTFB | Edge/CDN | Best for |
|---|---|---|---|---|
| Vercel (Pro) | ~EUR 20-90/mo | 0.1-0.4s | Included, global | Next.js, JAMstack |
| Hetzner (edge + CDN) | ~EUR 15-60/mo | 0.3-0.7s | CDN option | EU sovereignty, budget |
| IONOS (VPS + CDN) | ~EUR 20-80/mo | 0.4-0.9s | CDN option | German hosting |
| Cloudflare (Pages + CDN) | EUR 0-25/mo | 0.1-0.3s | Included, global | Static/hybrid sites |
| Classic shared hosting | EUR 5-20/mo | 0.8-2s | Rare | Avoid for CWV |
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Moving from shared hosting to edge often gains 1 to 1.5s of TTFB alone, without touching the code.
Mini case study
Sophie, marketing director at a B2B SaaS vendor in Berlin, has a 4.2s LCP and a 2.1% conversion rate on 30,000 monthly visits, i.e. 630 leads. Each lead is worth an average EUR 25 in pipeline value. She invests EUR 6,200: full audit (2,000), AVIF images (1,500), cache/lazy-load (1,200), Vercel migration (1,500).
Result at 8 weeks: LCP at 1.9s, conversion at 2.4% (+14%), i.e. 720 leads/month. The gain of 90 monthly leads represents ~EUR 2,250/month in pipeline value: the investment pays back in under 3 months, excluding SEO gains.
FAQ
Does a good CWV score really improve rankings? It is a real but secondary ranking factor: with equal content, it acts as a tie-breaker. Its strongest impact is on conversion and bounce rate, not SEO alone.
Do you have to rebuild the whole site to improve Core Web Vitals? Rarely. 70-80% of the gains come from image optimization, caching and hosting, without touching the design. A full rebuild is only justified if the code is structurally blocking.
What is the difference between lab and field data? Lighthouse measures in the lab (simulated conditions); the CrUX report and INP measure the field (real users). Google relies on field data: that is what counts for ranking.
How much does maintaining performance over time cost? Plan a quarterly check of EUR 300-600, because each content addition, third-party script or marketing tag can degrade scores. Performance is maintenance, not a one-off.
Is edge hosting essential? No, but it is the best cost/benefit lever when TTFB exceeds 0.8s. For an already well-hosted site, the effort belongs on images and JavaScript instead.
Let's scope your project. LCP in the red? Send us your URL and current scores, and we'll price the audit and optimization plan. 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.
