The verdict in three sentences
If your B2B website fails Core Web Vitals on mobile, budget the work in two steps: an audit at EUR 1,200 to 3,000, then fixes at EUR 3,000 to 12,000 (about USD 1,300 to 3,300 and USD 3,300 to 13,200), over 3 to 6 weeks. The targets are clear: LCP under 2.5 s, INP under 200 ms and CLS under 0.1 at the 75th percentile of real visits. On comparable projects, the conversion rate gain sits between 15 and 25%, which often pays back the budget within a quarter.
The three metrics and what breaks them
Google measures Core Web Vitals on real Chrome visits (the CrUX report), not on a one-off test. A site can score 90 on desktop PageSpeed and still fail on mobile 4G.
| Metric | "Good" threshold | Typical value on a failing B2B site | Common causes |
|---|---|---|---|
| LCP (main content display) | < 2.5 s | 3.8 to 5.5 s | Unoptimised hero image, slow server, blocking fonts |
| INP (responsiveness) | < 200 ms | 350 to 700 ms | Too much JavaScript, chat, tag managers, sliders |
| CLS (visual stability) | < 0.1 | 0.18 to 0.35 | Cookie banner, images without dimensions, ads |
| TTFB (server time) | < 0.8 s | 1.2 to 2.5 s | Shared hosting, no cache or CDN |
| Mobile page weight | < 1.5 MB | 4 to 8 MB | Autoplay video, heavy PNGs, unused libraries |
On B2B sites, the main culprit is often a pile of marketing scripts: CRM, chat, heatmaps, ad pixels. Each one adds 50 to 150 ms of INP.
Budget: audit, then fixes
| Service | Budget | Timeline | Deliverable |
|---|---|---|---|
| Express audit (10 key pages) | EUR 1,200 to 1,800 | 1 week | Prioritised report, quick wins |
| Full audit (templates + third-party scripts) | EUR 2,000 to 3,000 | 1 to 2 weeks | Action plan priced per fix |
| Light fixes (images, cache, fonts) | EUR 3,000 to 5,000 | 2 to 3 weeks | LCP and CLS green |
| Medium fixes (third-party scripts, CDN, lazy loading) | EUR 5,000 to 8,000 | 3 to 4 weeks | INP green |
| Front-end rebuild (heavy theme, page builder) | EUR 8,000 to 12,000 | 4 to 6 weeks | All three metrics green for good |
| Monthly monitoring | EUR 150 to 400 / month | Ongoing | Alert on regression |
Allow 28 days after release for the CrUX report to reflect the improvement, since Google aggregates data over a rolling window.
Why it brings in leads
A B2B buyer often visits your site from a phone between meetings. When LCP exceeds 4 s, more than half of mobile visits drop before the first screen. Gains observed in 2026 on industrial and services sites: 15 to 25% more forms submitted, mobile bounce rate down 10 to 20 points, and a slight ranking edge on competitive queries with equivalent content.
Mini case study
Daniel, marketing director of a 120-person automation integrator in Singapore, sees his site fail on mobile: LCP 4.6 s, INP 480 ms. He orders a full audit at EUR 2,400 and medium fixes at EUR 6,800, i.e. EUR 9,200 over 5 weeks. Result: LCP 1.9 s, INP 160 ms. Contact requests rise from 60 to 72 a month (+20%). With a 12% close rate and EUR 4,500 margin per deal, the 12 extra leads are worth about EUR 6,480 of monthly margin. The budget pays back in under 2 months.
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FAQ
How much does a Core Web Vitals audit cost in Singapore in 2026?
EUR 1,200 to 3,000 (about USD 1,300 to 3,300) depending on templates and third-party scripts analysed. An express audit of 10 key pages is around EUR 1,500.
Do we need to rebuild the whole site to go green?
Rarely. In roughly 70% of cases, targeted fixes of EUR 3,000 to 8,000 are enough. A front-end rebuild is only needed with a very heavy page builder.
How long until Google sees the improvement?
The CrUX report updates over a rolling 28 days. Allow 4 weeks after fixes go live to see Search Console turn green.
Does INP really matter for a B2B site?
Yes, it replaced FID in 2024 and penalises sites loaded with marketing scripts. Above 200 ms, clicks on forms and menus feel slow and drive visitors away.
Is the conversion gain guaranteed?
No, 15 to 25% is an observed range, not a promise. It depends on your mobile traffic share, often 45 to 60% in B2B in 2026.
Let's scope your project. Send us your website URL: we will price an audit between EUR 1,200 and 3,000 and a prioritised fix plan, delivered in 3 to 6 weeks. 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.
