The verdict in three sentences
In 2026, a Core Web Vitals performance audit is budgeted between EUR 1,000 and 2,800, and the remediation project (LCP, INP, CLS) between EUR 4,000 and 14,000 depending on technical debt. The reference targets remain LCP under 2.5s, INP under 200ms, CLS under 0.1. Expected return: +10% to +30% organic clicks, -20% bounce rate and a better Quality Score on your Ads campaigns, which lowers cost per click.
Targets and gains per metric
Before pricing, you need to know which metric is costliest to fix. INP, now an official metric, is often the underestimated line on B2B sites loaded with marketing scripts.
| Metric | 2026 "good" threshold | Typical before | After remediation | Difficulty |
|---|---|---|---|---|
| LCP (loading) | < 2.5s | 3.8 - 5.2s | 1.8 - 2.4s | medium |
| INP (interactivity) | < 200ms | 300 - 550ms | 120 - 190ms | high |
| CLS (visual stability) | < 0.1 | 0.18 - 0.35 | 0.02 - 0.08 | low |
| TTFB (server) | < 800ms | 1.1 - 1.8s | 400 - 700ms | medium |
CLS is cheapest to fix (image dimensions, space reservation); INP is costliest as it involves JavaScript and third-party tags.
Work packages and budget
A serious performance project breaks down into parts. Beware of "speed optimisation" offers at EUR 500: they install a cache plugin and stop there.
| Work package | 2026 budget (EUR) | Main gain |
|---|---|---|
| Full audit + prioritisation | 1,000 - 2,800 | roadmap |
| Image optimisation (WebP/AVIF, lazy) | 700 - 2,200 | LCP, weight |
| JS / third-party tag rework | 2,000 - 6,000 | INP, TTFB |
| Caching + CDN | 1,000 - 2,800 | TTFB, LCP |
| Space reservation / fonts | 600 - 1,800 | CLS |
| Post-project monitoring (3 months) | 500 - 1,400/mo | sustain |
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Mini case study
Sarah is head of acquisition at a B2B software vendor in Amsterdam, ahead of a EUR 6,000/month paid-search campaign. Her site shows a 4.6s LCP and a 420ms INP. She commissions an audit (EUR 1,900) then a remediation project (EUR 9,500, 5 weeks). Result: LCP at 2.1s, INP at 165ms. Bounce rate falls from 58% to 46% and the average Quality Score rises, cutting CPC by 14%. On a EUR 6,000/month budget, that reduction is worth about EUR 840/month, paying back the project in under 12 months, before even counting the +18% organic clicks.
FAQ
Is a cache plugin enough? No. Caching improves TTFB but fixes neither INP (JavaScript) nor CLS (layout). A real project combines several packages.
Does INP really matter in 2026? Yes, it is an official Core Web Vitals metric. On B2B sites loaded with marketing tags it is often the most degraded and most penalising metric.
What realistic SEO gain should I expect? Roughly +10% to +30% organic clicks depending on competition, with content held equal. Performance is one factor among several, but a measurable one.
Does performance affect my Ads campaigns? Yes. A fast page improves Quality Score, lowering cost per click. This ROI is often overlooked in performance quotes.
How long until I see results? Technical metrics improve immediately; the SEO effect shows over 6 to 12 weeks as field data (CrUX) updates.
Let's scope your project. Send us your URL and current scores; we'll price the audit (EUR 1,000-2,800) and the project (EUR 4,000-14,000) with measurable 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.
