The verdict in three sentences
When a B2B website loses 25% of its organic traffic after a Google update, a full redesign is rarely the first answer: a 10-day performance audit, billed at 2,500 to 6,000 EUR excl. VAT, pinpoints what is costing rankings and conversions. The fixes that follow represent 4,000 to 15,000 EUR, with measurable targets: LCP under 2.5 s, INP under 200 ms, CLS under 0.1. Conversion gains observed after the fixes range from 8 to 20%, which pays back the work within a few months for a mid-sized company generating leads online.
What a serious audit includes in 2026
A performance audit is not just a PageSpeed Insights score. For a mid-sized industrial or services company in Dublin or Rennes, with a site of 200 to 2,000 pages, the expected deliverables are:
- CrUX field data over 28 days, per page template (home, product pages, service pages, blog), not just a lab measurement.
- Rendering analysis: page weight, third-party scripts (chat, tag managers, A/B testing tools), fonts, unoptimised images, JavaScript hydration.
- Technical crawl: orphan pages, redirect chains, inconsistent canonicals, crawl budget wasted on facets.
- Cross-check with Search Console: which pages lost positions and whether their metrics are in the red.
- Prioritised fix plan with effort in days and expected impact.
| Audit format | Scope | 2026 price | Timeline |
|---|---|---|---|
| Flash | 5 templates, CrUX data, top 10 actions | 2,500 EUR | 5 days |
| Standard | 10 templates, full crawl, third-party scripts, prioritised plan | 4,000 EUR | 10 days |
| In-depth | multilingual site, B2B e-commerce, server and CDN analysis | 6,000 EUR | 10 to 15 days |
| Quarterly follow-up | CrUX remeasurement, regression alerts | 600 to 900 EUR per quarter | ongoing |
Typical findings and the cost of each fix
Here are the issues we most often find on B2B websites audited in 2026, with an order-of-magnitude fix cost.
| Finding | Metric affected | Fix | Estimated cost |
|---|---|---|---|
| 1.8 MB hero image not prioritised | LCP at 4.2 s | AVIF, preload, fixed dimensions | 800 to 1,500 EUR |
| 14 third-party scripts loaded at start | INP at 380 ms | triage, deferred loading, chat facade | 1,500 to 3,500 EUR |
| Cookie banner shifting the page | CLS at 0.24 | reserved space, native loading | 500 to 1,000 EUR |
| WordPress theme with page builder | LCP and INP | rebuild of critical templates | 4,000 to 9,000 EUR |
| Shared server without CDN | TTFB at 1.4 s | managed hosting, cache, CDN | 1,000 to 2,500 EUR + 80 to 200 EUR a month |
| Render-blocking web fonts | LCP | self-hosting, subsetting, font-display | 400 to 800 EUR |
| Thousands of indexable facets | crawl and rankings | robots rules, canonicals, noindex | 800 to 2,000 EUR |
The total for priority fixes usually lands between 4,000 and 15,000 EUR. Beyond that, rebuilding the technical foundation becomes a serious question.
How to read the link between performance and traffic
Core Web Vitals are one ranking signal among others: they do not make up for weak content, but they break ties between similar pages. On a B2B website, the most visible effect is on conversion. A quote request form that responds in 450 ms instead of 120 ms, a service page that renders in 1.9 s instead of 4 s: these are abandonments avoided. That is why the audit must measure conversion rate per template before and after the fixes, over at least 6 weeks.
Mini case study
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Nathalie, marketing manager of a 350-employee food equipment manufacturer, sees organic traffic fall from 18,000 to 13,500 visits a month. She orders a standard audit at 4,000 EUR, then 9,500 EUR of fixes. Mobile LCP drops from 4.1 s to 2.2 s and INP from 340 ms to 160 ms. Three months later, traffic climbs back to 16,800 visits and conversion rises from 1.2% to 1.4%, or 235 requests instead of 162 a month. With 3% of requests signed and an average margin of 6,000 EUR per contract, the monthly gain approaches 13,000 EUR: the 13,500 EUR investment pays back in just over a month.
FAQ
How much does a B2B website performance audit cost in 2026?
Between 2,500 and 6,000 EUR excl. VAT depending on the number of templates and technical complexity. A standard 10-day audit is around 4,000 EUR.
What Core Web Vitals thresholds should we hit?
LCP under 2.5 s, INP under 200 ms and CLS under 0.1, measured on 75% of real visits. These thresholds are assessed on field data, not only on a lab test.
How long before traffic is affected?
CrUX data updates on a rolling 28-day window, so allow 4 to 8 weeks after the fixes for an effect on rankings.
Should we redesign instead of auditing?
If fixes exceed 15,000 EUR or the current theme blocks any optimisation, a redesign becomes relevant. The audit is precisely what proves it with numbers.
Can our in-house team do the fixes?
Yes, the prioritised plan is written to be executed by an internal team or a vendor. About 40% of the actions are configuration and need no development.
Let's scope your project. Send us your website URL and your traffic trend over 12 months, and we will propose a performance audit at 2,500 to 6,000 EUR delivered in 10 days, with a costed fix 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.
