The verdict in three sentences
A B2B brochure site that fails Core Web Vitals loses rankings and conversions at the same time. In Amsterdam in 2026, a full performance pass costs EUR 2,500 to 6,000 and targets LCP <2.5 s, INP <200 ms, CLS <0.1. The return shows in weeks: +8 to +20 % conversion depending on the starting point.
What going green actually costs
Separate the audit (measured diagnosis) from the project (fixes). Many Amsterdam SMEs underestimate the second line item.
| Service | Content | Timeline | 2026 price (EUR) |
|---|---|---|---|
| Performance audit | Field + lab metrics, prioritised plan | 5 days | 900 - 1,800 |
| Light project | Images, cache, lazy-load, fonts | 2 weeks | 2,500 - 3,500 |
| Standard project | + JS, critical CSS, CDN, hosting | 3 weeks | 3,800 - 5,000 |
| Heavy project | + front refactor, hydration, AVIF images | 4 weeks | 5,000 - 6,000 |
These figures are a 2026 order of magnitude for a 5-20 page brochure site. E-commerce or high-traffic sites fall outside this grid.
Technical targets and their business effect
Google does not reward speed for its own sake: it rewards the user experience it reflects. Here are the thresholds and the link to conversion.
| Metric | 2026 "good" threshold | Typical impact when met |
|---|---|---|
| LCP (loading) | < 2.5 s | -1 s LCP: +5-10 % conversion |
| INP (interactivity) | < 200 ms | Fewer form abandonments |
| CLS (visual stability) | < 0.1 | -20 % accidental clicks |
| Page weight | < 800 KB | Better mobile resilience |
| TTFB (server) | < 600 ms | Foundation of a good LCP |
A well-run project often moves an LCP from 4.2 s to under 2 s, shifting the site into the green zone of the Chrome experience report.
Mini case study
Sarah, digital lead at a B2B medical equipment SME in Amsterdam, measures a 4.2 s LCP and a 2.1 % form conversion rate. She approves a standard project at EUR 4,400. After three weeks, the LCP drops to 1.9 s and conversion rises to 2.6 %, a +24 % relative lift. On 3,500 monthly visits that means about twenty extra leads a month: the project pays back in under a quarter given her contract value.
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
FAQ
Do I need an audit before the project?
Yes: without field data (real user metrics), you optimise blind. The EUR 900-1,800 audit prevents spending on the wrong work.
How long does an optimisation take?
From 2 to 4 weeks depending on depth. A light project (images, cache) can deliver visible gains in 10 days.
Do Core Web Vitals really affect ranking?
They are one signal among many, but a tie-breaker at equal content, and above all they directly drive conversion, which matters even more.
Is shared hosting a blocker?
Often yes: a high TTFB drags down LCP. Migrating to performant hosting or a CDN is part of the standard project.
Are the gains durable?
Yes, if future updates are governed. Adding one heavy image or third-party script can wipe out gains, which is why a vigilance budget helps.
Let's scope your project. Send us your brochure site URL and current scores: we will price the audit then the project with LCP/INP targets. 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.
