The verdict in three sentences
Core Web Vitals (LCP, INP, CLS) are a Google ranking signal and a conversion multiplier: below the thresholds you lose both traffic and leads. A performance audit at EUR 1,500-4,000 identifies the bottlenecks, an optimisation project at EUR 4,000-12,000 fixes them, for a 10-25% gain on SEO and conversion. The investment pays back fast because every second of load time saved directly improves the contact rate.
Google's 2026 thresholds to hit
Google publishes clear thresholds. Being "good" on all three metrics for 75% of visits is the operational target.
| Metric | Good | Needs work | Poor |
|---|---|---|---|
| LCP (loading) | < 2.5 s | 2.5-4 s | > 4 s |
| INP (interactivity) | < 200 ms | 200-500 ms | > 500 ms |
| CLS (visual stability) | < 0.1 | 0.1-0.25 | > 0.25 |
| Mobile Lighthouse score | > 90 | 50-90 | < 50 |
| Recommended page weight | < 1 MB | 1-2.5 MB | > 2.5 MB |
Moving from red to green on these three metrics is the foundation of a credible technical-SEO strategy in 2026.
Budget and business impact of optimisation
Optimisation is not a comfort spend: it is measured in traffic and leads gained. Here are the items and their return.
| Intervention | Cost 2026 | Expected gain | Timeline |
|---|---|---|---|
| Full performance audit | EUR 1,500-4,000 | Costed roadmap | 1-2 weeks |
| Image/media optimisation | EUR 1,500-3,500 | LCP -30 to -50% | 1-2 weeks |
| JS refactor / INP fix | EUR 2,500-6,000 | INP < 200 ms | 2-3 weeks |
| CDN + caching setup | EUR 30-120/mo | Latency -40 to -60% | 1 week |
| Full project | EUR 4,000-12,000 | +10-25% SEO/conversion | 2-6 weeks |
On a B2B site generating 300 leads/month, a 15% gain is 45 extra leads at flat acquisition budget.
Mini case study
Julia, SEO lead at a SaaS scale-up in Berlin, sees her site rated "poor" on LCP (4.2 s) and INP (380 ms), with a mobile Lighthouse of 38. Organic traffic stalls despite strong content. We scope an optimisation project at EUR 9,500 over 4 weeks: LCP down to 1.6 s, INP to 150 ms, CDN at EUR 60/month. Target: +18% organic traffic and +12% conversion. On 320 leads/month, that is roughly 57 extra leads. At an equivalent paid cost per lead of EUR 70, the monthly saving reaches about EUR 3,990: the project pays back in under 3 months.
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FAQ
Do Core Web Vitals really affect Google ranking?
Yes: they are part of Page Experience and act as a tie-breaker between comparable content. A fast, stable site is favoured, especially on mobile. It is not the only factor, but it is a measurable signal your competitors are already optimising.
How much does a performance audit cost in Berlin in 2026?
Between EUR 1,500 and EUR 4,000 depending on site size and analysis depth. The audit delivers a prioritised, costed roadmap, which stops you investing blindly in optimisations with no impact.
How soon do SEO gains appear?
Technical gains (speed, stability) are immediate for the user. On the SEO side, the ranking effect usually materialises in 4-10 weeks, the time Google needs to recrawl and re-evaluate Page Experience.
What is the link between performance and conversion?
Direct: every second of load time removed cuts bounce rate and lifts the contact rate. An LCP gain from 4 s to 1.5 s can improve conversion by 10-25% depending on the journey.
Is a CDN enough to fix Core Web Vitals?
No: a CDN reduces network latency but fixes neither heavy JavaScript (INP), unoptimised images (LCP) nor layout shifts (CLS). It is part of the solution, not the whole.
Let's scope your project. Send us your URL and current Core Web Vitals scores, and we will price the audit and the optimisation project. 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.
