The verdict in three sentences
A B2B website with 70% of its pages flagged "needs improvement" in Search Console loses both rankings and quote requests. An audit at EUR 1,500 to 3,500 followed by EUR 4,000 to 12,000 of fixes is enough in most cases, without a rebuild. After the fixes, industrial distributors see a conversion lift of 8 to 15%, which pays back the work within a few months.
The three metrics and their 2026 thresholds
Google assesses real visitor experience over 28 days, using Chrome UX Report data. A page is "good" when 75% of visits meet the thresholds.
| Metric | What it measures | "Good" threshold | Typical value on an unoptimised B2B catalogue | Common causes |
|---|---|---|---|---|
| LCP | Rendering of the largest visible element | Under 2.5 s | 3.8 to 5.5 s | Heavy product images, slow server, render-blocking fonts |
| INP | Responsiveness after a click or input | Under 200 ms | 350 to 600 ms | Third-party scripts, JavaScript-heavy catalogue filters |
| CLS | Visual stability during loading | Under 0.1 | 0.18 to 0.35 | Cookie banners, images without dimensions, chat widgets |
| TTFB (diagnostic metric) | Server response time | Under 0.8 s | 1.2 to 2 s | Shared hosting, no caching |
INP replaced FID in 2024 and hits catalogues with dynamic filters, configurators and chat tools particularly hard.
What the audit and fixes cost
| Service | Scope | 2026 budget ex. VAT | Timeline |
|---|---|---|---|
| Express audit | 10 templates, prioritised report | EUR 1,500 to 2,000 | 1 week |
| Full audit | All templates, field data, costed fix plan | EUR 2,500 to 3,500 | 2 weeks |
| Targeted fixes | Images, fonts, caching, CLS | EUR 4,000 to 6,000 | 2 to 3 weeks |
| Advanced fixes | Third-party scripts, server rendering, filter rebuild | EUR 7,000 to 12,000 | 4 to 6 weeks |
| Monthly monitoring | Alerts, checks after each release | EUR 150 to 400 per month | Ongoing |
Fixes ranked by cost and impact
Not all fixes are equal. Start with those that combine low cost and high impact.
| Fix | Target metric | Estimated cost | Impact |
|---|---|---|---|
| Product images in AVIF or WebP, fixed dimensions | LCP, CLS | EUR 800 to 1,500 | High |
| Preload of hero image and fonts | LCP | EUR 300 to 600 | High |
| Server caching and CDN | LCP, TTFB | EUR 500 to 1,200 | High |
| Deferred third-party scripts (chat, tags, maps) | INP | EUR 1,000 to 2,500 | High |
| Reserved space for cookie banner and widgets | CLS | EUR 400 to 900 | Medium |
| Server-side rebuild of catalogue filters | INP | EUR 3,000 to 6,000 | High on category pages |
| Move to dedicated hosting or a modern framework | All | EUR 8,000 and up | Variable |
A simple rule: if the audit shows that more than 60% of page weight comes from the theme and page builders, a migration becomes more profitable than successive fixes.
Mini case study
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Nadia, marketing manager at an industrial supplies distributor in London, finds that 70% of her 1,200 URLs "need improvement". The site receives 12,000 visits per month and converts 1.1% into quote requests, that is 132 requests. She commissions a full audit at EUR 2,800 and fixes at EUR 7,500, EUR 10,300 in total. After 6 weeks, LCP drops from 4.6 to 2.1 seconds and INP from 420 to 160 ms. The conversion rate rises to 1.25%, that is 18 more requests per month, a 13.6% increase. With 1 request in 5 converting and an average gross margin of EUR 900 per order, the gain is about EUR 3,240 per month: the work pays for itself in just over 3 months.
FAQ
How much does a Core Web Vitals audit cost in 2026?
Between EUR 1,500 and 3,500 ex. VAT depending on the number of templates analysed. A full audit includes a costed, prioritised fix plan.
How much do the fixes cost?
EUR 4,000 to 12,000 for a B2B site, depending on third-party scripts and catalogue structure. Simple image and caching fixes often cost under EUR 3,000.
How quickly do results show in Search Console?
Field data covers a rolling 28 days. Allow 4 to 6 weeks after release for pages to move to "good".
What conversion lift should we expect?
A lift of 8 to 15% is frequently observed on B2B sites after fixes. It depends on the starting point and the share of mobile traffic.
Do we need a full rebuild?
Not necessarily. A rebuild makes sense if more than 60% of page weight comes from the theme or if TTFB stays above one second after cache optimisation.
Let's scope your project. Send us your site URL and a Search Console export: we price the audit and priority fixes, with an indicative budget and a 2 to 6 week timeline. 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.
