The verdict in three sentences
A high bounce rate on a B2B site is almost always a technical performance problem before it is a content problem. A Core Web Vitals audit costs 1,500 to 4,000 EUR, fixes run 3,000 to 9,000 EUR depending on technical debt. The numeric stake: every 100 ms gained is worth 1 to 2 % more conversion on a quote-request funnel.
Cost of an audit and fixes in 2026
The audit measures Google's three key metrics (LCP, INP, CLS) on field data (CrUX) and lab data (Lighthouse), then prioritizes fixes by impact. Price depends on the number of templates and CMS complexity.
| Service | Price (EUR) | Timeline |
|---|---|---|
| Performance audit (brochure site < 20 pages) | 1,500 - 2,500 | 5 - 8 days |
| Performance audit (complex B2B / e-commerce) | 2,500 - 4,000 | 8 - 15 days |
| Front-end fixes (images, JS, critical CSS) | 3,000 - 6,000 | 2 - 4 weeks |
| Heavy fixes (template rebuild, SSR) | 6,000 - 9,000 | 4 - 8 weeks |
| Continuous monitoring (RUM) | 150 - 400 / month | recurring |
The targets to hit and the conversion impact
Google rates a metric "good" at the 75th percentile of visits. Missing these thresholds penalizes both ranking and conversion rate. Here are the 2026 targets and observed conversion gains.
| Metric | "Good" threshold | "Needs fixing" | Impact of improvement |
|---|---|---|---|
| LCP (loading) | < 2.5 s | > 4.0 s | -100 ms = +1 to 2 % conversion |
| INP (interactivity) | < 200 ms | > 500 ms | -50 ms = -3 to 5 % rage clicks |
| CLS (visual stability) | < 0.1 | > 0.25 | -0.1 = -8 to 12 % form abandonment |
| Mobile Lighthouse score | > 90 | < 50 | +30 pts = +15 to 25 % engagement |
These 2026 orders of magnitude are estimates from sector studies; real impact depends on your funnel and traffic.
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Mini case study
Thomas is marketing director of an industrial SMB in Lyon. His site shows a 4.8 s LCP and a 62 % bounce rate. He orders an audit at 2,800 EUR then fixes at 5,500 EUR, or 8,300 EUR total. LCP drops to 2.1 s, bounce falls to 44 %. On 12,000 visits/month with conversion rising from 1.8 % to 2.7 %, he gains 108 additional quote requests/month. At an 8 % close rate and a 6,000 EUR average deal, that is roughly 51,000 EUR in additional monthly revenue: the investment is repaid in under two weeks.
FAQ
How long does a Core Web Vitals audit take? From 5 to 15 business days depending on site size. A rigorous audit cross-references field data (CrUX/RUM) and lab data, tests multiple templates and delivers a prioritized fix plan.
What is the difference between audit and fixes? The audit diagnoses and costs; the fixes execute. Many companies pay for the audit then implement fixes in-house, which stays feasible with a well-documented report.
Did INP replace FID in 2026? Yes, INP has been the official interactivity metric since 2024. It measures real responsiveness across the whole session, penalizing sites heavy with unoptimized JavaScript.
Is a Lighthouse score of 100 necessary? No. Aiming for 90+ on mobile is enough to be in the green. Chasing 100 costs many hours for marginal gain; better to invest in the conversion funnel.
How often should I re-audit? A quarterly check plus continuous RUM monitoring (150 to 400 EUR/month) is enough. Every feature release can degrade metrics, which is why automated tracking matters.
Let's scope your project. Send us your B2B site URL and your conversion goals: we quote the audit and fixes with an impact-prioritized 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.
