The verdict in three sentences
A Core Web Vitals audit costs 1,500 to 3,500 EUR in 2026 and hands you a prioritized action plan, not just a report. The goal: INP under 200 ms, LCP under 2.5s and CLS under 0.1, the three thresholds Google uses to rank. Every second of load time saved is worth +7 to +12% conversion, which pays back the audit fast for a B2B online seller.
What the audit contains
A good audit does not just run Lighthouse. It cross-references lab and field data (CrUX), spots bottlenecks and prices the effort of each fix.
| Service | Range EUR | Deliverable |
|---|---|---|
| Express audit (1 template) | 1,500 - 2,000 | Report + 10 actions |
| Standard audit (full site) | 2,500 - 3,500 | Prioritized plan + costing |
| Audit + fix implementation | 4,000 - 8,000 | Audit + delivery |
| Monthly Web Vitals monitoring | 250 - 600 /mo | Monitoring + alerts |
| 28-day field test | included | Real CrUX data |
The levers that pay the most
Most gains come from three areas: images, JavaScript and fonts. Image optimization alone often cuts weight by 60%.
| Lever | Before | After | Main gain |
|---|---|---|---|
| WebP/AVIF images + lazy-load | 2.8 MB | 1.1 MB | -60% weight, LCP |
| Cut unused JS | 640 KB | 210 KB | INP, TBT |
| Font preload + swap | 380 ms block | 40 ms | LCP, CLS |
| CDN cache + Brotli | 1.9s TTFB | 0.4s | LCP |
| Reserve media space | CLS 0.28 | CLS 0.04 | Visual stability |
| Defer third-party scripts | INP 340 ms | INP 150 ms | Interactivity |
Mini case study
Sophie, e-commerce director at a B2B wholesaler in Berlin, sells trade supplies with a 480 EUR average basket. Her site loads in 3.6s and INP sits at 340 ms: Google demotes it. She orders a standard audit at 3,000 EUR. The plan brings LCP to 2.1s (1.5s saved) and INP to 150 ms. At +8% conversion per second saved, on 40,000 EUR monthly revenue, that is roughly 4,800 EUR of additional revenue per month. The audit and its implementation (8,000 EUR total) pay back in under two months.
FAQ
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
What is the difference between an audit and a rebuild?
The audit diagnoses and prioritizes without touching design; it costs 1,500 to 3,500 EUR. A rebuild reconstructs the site and runs into tens of thousands. You always start with the audit.
What is INP and why does it matter in 2026?
INP (Interaction to Next Paint) measures responsiveness to clicks and inputs; it replaced FID. The green threshold is 200 ms. Above it, the experience feels "heavy" and rankings suffer.
How long until results show?
Technical fixes take 3 to 5 weeks. Field data (CrUX) updates over a rolling 28-day window: expect 4 to 8 weeks for a stable SEO signal.
Does a Lighthouse score of 100 guarantee good rankings?
No. Lighthouse is a lab measure; Google ranks on field data (real users). A good audit targets both, with priority on the field.
Do I need monitoring after the audit?
Yes, monthly monitoring at 250-600 EUR prevents regression: every added plugin or third-party script can degrade INP without anyone noticing.
Let's scope your project. Send us your URL, CMS and high-traffic pages: we deliver a costed audit and a prioritized action 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.
