The verdict in three sentences
If your site shows an LCP above 4 seconds or an INP above 500 ms, you are losing both Google rankings and quote requests. An audit at 1,500 to 3,500 EUR in Amsterdam (800 to 2,000 EUR in Bordeaux) followed by fixes at 2,000 to 8,000 EUR solves the problem in 70 % of cases within 2 to 6 weeks. A full rebuild at 8,000 to 20,000 EUR is only justified when the theme or CMS blocks any lasting improvement.
The thresholds that matter in 2026
Google measures three metrics on real visits (CrUX data), at the 75th percentile. A site must pass all three to be rated « good ».
| Metric | What it measures | Good | Needs improvement | Poor |
|---|---|---|---|---|
| LCP (Largest Contentful Paint) | Main content display | 2.5 s or less | 2.5 to 4 s | over 4 s |
| INP (Interaction to Next Paint) | Responsiveness to clicks and input | 200 ms or less | 200 to 500 ms | over 500 ms |
| CLS (Cumulative Layout Shift) | Visual stability | 0.1 or less | 0.1 to 0.25 | over 0.25 |
On the SME sites we audit, the causes keep repeating: uncompressed images of 1 to 4 MB, page builders loading 30 to 60 scripts, stacked chat and tracking tools, badly loaded web fonts and undersized shared hosting.
Price and timeline by level of work
| Work | Amsterdam price | Bordeaux price (excl. VAT) | Timeline | Typical result |
|---|---|---|---|---|
| Quick audit (automated tools + report) | 500 to 900 EUR | 300 to 600 EUR | 3 to 5 days | Issue list, no detailed prioritisation |
| Full Core Web Vitals audit | 1,500 to 3,500 EUR | 800 to 2,000 EUR | 1 to 2 weeks | Page-level diagnosis, costed priority plan |
| Targeted fixes (images, scripts, cache, fonts) | 3,000 to 7,000 EUR | 2,000 to 5,000 EUR | 2 to 3 weeks | LCP cut by 30 to 50 % |
| Heavy fixes (theme, hosting, template rework) | 7,000 to 12,000 EUR | 5,000 to 8,000 EUR | 3 to 6 weeks | Green on 2 or 3 metrics |
| Full rebuild (Next.js or equivalent) | 12,000 to 30,000 EUR | 8,000 to 20,000 EUR | 8 to 14 weeks | LCP under 1.5 s, INP under 150 ms |
| Monthly performance monitoring | 150 to 400 EUR | 100 to 300 EUR | ongoing | Alert on regression |
The gap between the two cities comes from day rates, not method.
Expected gains and how to measure them
Core Web Vitals are one ranking factor among many. The clearest effect is on conversion, especially on mobile.
| Business metric | Before (slow site) | After fixes | Observed change |
|---|---|---|---|
| Mobile bounce rate | 60 to 75 % | 45 to 55 % | down 10 to 20 points |
| Quote form conversion | 1.2 to 2 % | 1.5 to 2.6 % | up 15 to 35 % |
| Pages per session | 1.6 to 2.2 | 2.1 to 2.8 | up 20 to 30 % |
| Average position on local queries | variable | gain of 1 to 4 places | depends on competition |
Measure before and after over at least 28 days, since CrUX data is a rolling window, and isolate other changes (campaigns, seasonality) so you do not credit speed for gains that came from elsewhere.
Mini case study
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
Julien runs a 35-person industrial joinery firm near Bordeaux and sees a mobile LCP of 5.1 s and an INP of 620 ms. He orders a 1,400 EUR audit, then 4,600 EUR of fixes: images converted to AVIF, 22 unneeded scripts removed, new hosting at 45 EUR a month. After 6 weeks: LCP at 2.2 s, INP at 180 ms. The site gets 9,000 visits a month and quote conversion rises from 1.4 to 1.85 %, about 40 extra requests a year. With 1 quote in 5 signed and an average margin of 3,500 EUR per job, the annual gain is around 28,000 EUR for 6,000 EUR invested. The same project in Amsterdam would cost about 9,500 EUR and still pay back within the first half-year.
FAQ
How much does a Core Web Vitals audit cost in Amsterdam?
Between 1,500 and 3,500 EUR for a full audit with a prioritised action plan. Audits under 800 EUR are usually limited to an automated report.
How long until results show in Google Search Console?
Field data updates on a rolling 28-day window. Allow 4 to 8 weeks after fixes for the status to turn green.
Do we have to leave WordPress to get a fast site?
Not necessarily. A well-built WordPress site reaches an LCP under 2.5 s. A rebuild is justified when the page builder ships more than 1 MB of JavaScript on every page.
Does hosting matter much?
Yes. Moving from 5 EUR a month shared hosting to optimised hosting at 30 to 60 EUR a month often cuts server response time from 800 ms to under 200 ms.
Are conversion gains guaranteed?
No. The 15 to 35 % observed are 2026 orders of magnitude for sites starting from poor scores. An already fast site will gain less.
Let's scope your project. Send us your site URL: we will price an audit at 800 to 3,500 EUR depending on location and a fix plan delivered in 2 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.
