The verdict in three sentences
An LCP above 4 seconds on mobile puts your B2B site in Google's red zone and drives away professional buyers who browse your catalog between meetings. For a distributor or manufacturer, whether in Toronto or Bordeaux, the realistic 2026 budget is 1,200 to 3,000 EUR for the audit (about 1,300 to 3,250 USD) and 3,000 to 12,000 EUR for the fixes (about 3,250 to 13,000 USD), depending on the CMS's technical debt. Well-scoped projects reach an LCP below 2.5 s and an INP under 200 ms within 3 to 6 weeks, with an observed 8 to 15% conversion lift on contact forms.
What Core Web Vitals really measure in 2026
Google scores three metrics on real visitor data (CrUX report, rolling 28 days, 75th percentile). A site passes only if all three are green on mobile. On the B2B sites we audit, failure almost always comes from uncompressed product images, late-loading fonts and third-party scripts (chat, tag manager, maps) that block the main thread.
| Metric | What it measures | Good threshold | Poor threshold | Common cause on a B2B site |
|---|---|---|---|---|
| LCP (Largest Contentful Paint) | Rendering of the largest visible element | < 2.5 s | > 4 s | 1.5 MB JPEG hero image, slow server |
| INP (Interaction to Next Paint) | Responsiveness to clicks and input | < 200 ms | > 500 ms | Third-party scripts, heavy JavaScript catalog filters |
| CLS (Cumulative Layout Shift) | Visual stability | < 0.1 | > 0.25 | Cookie banner, images without dimensions |
| TTFB (diagnostic metric) | Server response time | < 800 ms | > 1.8 s | Shared hosting, no caching |
| Mobile page weight | Transferred volume | < 1.5 MB | > 4 MB | Autoplay warehouse videos, carousels |
The key point: a lab Lighthouse score of 90 does not guarantee green in Search Console. Field data is what counts, and it takes 28 days to reflect your fixes.
2026 pricing: audit, fixes and keeping performance
Cost depends less on page count than on technology. A WordPress site with a visual builder and 40 plugins needs more work than a well-built Next.js site. Here are the 2026 orders of magnitude.
| Service | Scope | Price 2026 (excl. tax) | Timeline |
|---|---|---|---|
| Express audit | 10 templates, prioritized report, CrUX data | 1,200 to 1,800 EUR | 5 business days |
| Full audit | All templates, third-party script analysis, costed plan | 2,000 to 3,000 EUR | 8 to 10 days |
| Level 1 fixes | AVIF/WebP images, fonts, caching, lazy loading | 3,000 to 5,000 EUR | 2 to 3 weeks |
| Level 2 fixes | Theme rework, plugin cleanup, CDN | 5,000 to 9,000 EUR | 3 to 5 weeks |
| Level 3 fixes | Partial migration to a modern front end | 9,000 to 12,000 EUR | 5 to 6 weeks |
| Performance monitoring | Monthly monitoring, alerts, regressions | 150 to 400 EUR / month | Ongoing |
Our advice: never start fixes without an audit. On a distribution site, 60% of the gain often comes from just three actions (hero image, hosting, third-party scripts), which can bring the bill toward the low end of the range.
Return on investment for a B2B company
A professional buyer does not order in one click, but judges your reliability by site speed. Studies published by Google and our clients' results converge: each second gained below the 3-second mark cuts mobile bounce rate by 10 to 20%. On a site generating 40 quote requests a month, a 10% gain means 4 more requests.
| Scenario | Mobile LCP | Form conversion rate | Requests / month (5,000 visits) |
|---|---|---|---|
| Before fixes | 4.3 s | 0.8% | 40 |
| Level 1 fixes | 2.9 s | 0.86% | 43 |
| Level 2 fixes | 2.2 s | 0.9% | 45 |
| Level 3 fixes | 1.6 s | 0.92% | 46 |
Mini case study
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Camille, marketing manager at a B2B wine distributor serving wine shops and restaurants, sees a mobile LCP of 4.6 s and an INP of 380 ms on the trade catalog. The full audit (2,400 EUR) reveals a 2.1 MB cellar image, shared hosting with a 1.9 s TTFB and four chat and tracking scripts. Level 2 fixes cost 6,800 EUR, for a total of 9,200 EUR (about 10,000 USD). After 5 weeks, LCP drops to 2.1 s and INP to 160 ms. The site goes from 38 to 43 price requests per month (+13%). With an average annual spend of 4,500 EUR per new trade client and a 25% close rate, the 5 extra requests generate about 5,600 EUR in monthly revenue: the investment pays back in under two months.
FAQ
How long until results show in Search Console?
Google field data covers a rolling 28 days. Allow 4 to 6 weeks after release for URLs to turn green, even though Lighthouse improves immediately.
Do we need to rebuild the whole site to fix Core Web Vitals?
Rarely. In 7 cases out of 10, targeted fixes between 3,000 and 9,000 EUR are enough. A rebuild makes sense when the theme carries more than 30 plugins or the CMS is no longer maintained.
Do Core Web Vitals really affect rankings?
They are part of page experience signals, with modest weight compared to content relevance. Their clearest effect is on conversion: an observed 8 to 15% lift on B2B forms.
What hosting should a fast B2B site use?
Hosting with server caching and a CDN, around 30 to 120 EUR a month, delivers a TTFB under 600 ms. Entry-level shared hosting often exceeds 1.5 s.
How do we stop performance from degrading after the fixes?
Monthly monitoring at 150 to 400 EUR catches regressions as soon as a new plugin or marketing script is added. Also set a page weight budget, for example 1.5 MB maximum.
Let's scope your project. Send us your site URL and we will price the audit and fix plan, between 1,200 and 12,000 EUR depending on your CMS, with a target LCP under 2.5 s 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.
