The verdict in three sentences
A B2B website that is slow on mobile loses quote requests before the buyer even sees your catalogue. A Core Web Vitals audit costs EUR 1,200 to 2,500 excl. VAT and technical fixes EUR 3,000 to 8,000 excl. VAT depending on accumulated debt. The observed gain on industrial distribution sites is between 8 and 15 % more quote requests, which pays back the project within a few months.
The three metrics and the thresholds to hit
Google assesses your visitors' real experience over a rolling 28 days, using Chrome browser data. A page "passes" when 75 % of visits meet all three thresholds.
| Metric | What it measures | "Good" threshold 2026 | Common failure cause on a B2B site |
|---|---|---|---|
| LCP (Largest Contentful Paint) | Time to render the largest element | Under 2.5 s | Uncompressed product photos, slow server |
| INP (Interaction to Next Paint) | Responsiveness to clicks and input | Under 200 ms | Chat scripts, marketing tags, heavy catalogue filters |
| CLS (Cumulative Layout Shift) | Visual stability | Under 0.1 | Cookie banners, images without dimensions, fonts |
| TTFB (diagnostic metric) | Server response | Under 0.8 s | Shared hosting, no caching |
| Mobile page weight | Data downloaded | Under 1.5 MB | Background videos, embedded datasheets |
On an industrial supplies distributor with 4,000 SKUs, the problem rarely comes from a single point. It is the stack of modules added over the years that pushes 62 % of pages into the red.
2026 prices: audit, fixes and monitoring
| Service | Range excl. VAT | Deliverable | Lead time |
|---|---|---|---|
| Core Web Vitals audit | EUR 1,200 to 2,500 | Report per page template, costed priorities | 1 to 2 weeks |
| Light fixes | EUR 3,000 to 4,500 | WebP/AVIF images, lazy loading, dimensions, fonts | 2 weeks |
| Medium fixes | EUR 4,500 to 6,500 | Plus third-party script clean-up, caching, CDN | 3 to 4 weeks |
| Heavy fixes | EUR 6,500 to 8,000 | Plus catalogue filter rebuild, server-side rendering | 4 to 6 weeks |
| Quarterly check | EUR 400 per quarter | Field data report, regression alerts | Recurring |
| Hosting migration if needed | EUR 800 to 2,000 | Dedicated server or optimised platform | 1 week |
The audit must work by template (home, category, product page, quote page) rather than page by page: fixing the "product page" template repairs thousands of URLs at once.
What the fixes change for sales
A maintenance buyer looking up a bearing or fitting reference on their phone, on the shop floor, will not wait 6 seconds. Gains observed on comparable B2B sites, as a 2026 ballpark:
- mobile bounce rate down 10 to 20 %;
- pages per session up 15 to 25 %;
- quote requests up 8 to 15 % at constant traffic;
- SEO rankings stabilised or improved on competitive queries.
These figures depend on the starting point. A site that is already decent will gain little, a site with a 5-second mobile LCP will gain a lot.
Mini case study
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
Sanne, marketing manager of an Amsterdam distributor of industrial supplies, receives 180 quote requests a month. The average signed quote is worth EUR 2,400 and the win rate is 25 %. Her audit (EUR 1,800) reveals a 450 ms INP on catalogue filters and a 4.1 s LCP. Medium-level fixes cost EUR 5,800 excl. VAT, for EUR 7,600 excl. VAT in total.
With a cautious 8 % gain, she gets 14 more requests a month, so 3.5 more signed quotes and about EUR 8,400 of additional monthly revenue. Even at a 25 % gross margin, the project pays back in under 4 months. The quarterly check at EUR 400 excl. VAT then protects the result against regressions.
FAQ
How much does a Core Web Vitals audit cost in 2026?
Budget EUR 1,200 to 2,500 excl. VAT depending on the number of templates and site complexity. The report should cost each fix and rank it by impact.
Do we need to rebuild the site to pass Core Web Vitals?
Rarely. In most cases, EUR 3,000 to 8,000 excl. VAT of fixes is enough. A rebuild is only justified if the CMS structurally prevents an LCP under 2.5 s.
How long before results show in Google?
Google's field data covers a rolling 28 days. Allow 4 to 6 weeks after release for pages to turn green in Search Console.
Which metric causes B2B sites the most trouble?
INP, introduced in 2024. Catalogue filters, chat widgets and marketing tags often push it beyond 300 ms on mobile.
Why a quarterly check?
Every new script or plugin can drag scores down. Monitoring at EUR 400 excl. VAT per quarter catches drift before it costs rankings and quotes.
Let's scope your project. Send us your website URL and monthly quote request volume: we price the audit and fixes between EUR 4,200 and 10,500 excl. VAT, delivered in 4 to 8 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.
