The verdict in three sentences
An industrial site with 3,000 product pages and 1,200 PDFs almost always fails Core Web Vitals for the same reasons: 2 to 4 MB images, stacked third-party scripts and pages rendered without caching. Getting LCP under 2.5 seconds and INP under 200 milliseconds takes an audit at EUR 1,500 to 4,000 (about USD 1,600 to 4,300) followed by a EUR 5,000 to 15,000 project, or a rebuild if the platform is worn out. The expected return is 10 to 25% more organic traffic and a higher quote-request rate on mobile.
Diagnosis: why an industrial catalogue is slow
The marketing manager of a hydraulic components maker sees a median LCP of 6.2 seconds in Search Console and 40% of URLs rated "poor". The causes are rarely mysterious. They pile up over the years: each new product line adds high-resolution visuals, each campaign adds a tracking script, and the original CMS was never designed for 3,000 pages.
| Common cause | Measured impact | Metric affected | Fix | Estimated effort |
|---|---|---|---|---|
| 2 to 4 MB JPEG product images | +2 to 4 s load time | LCP | AVIF/WebP, responsive sizes | 2 to 4 days |
| PDFs embedded or previewed in-page | +1 to 3 MB per page | LCP, INP | Download link, image preview | 1 to 2 days |
| 6 to 12 third-party scripts (chat, tags, maps) | +300 to 800 ms blocking | INP | Deferred loading, consent management | 2 to 3 days |
| Heavy JavaScript product configurator | Interactions at 400 ms and above | INP | Code splitting, server-side calculation | 4 to 8 days |
| Pages rendered on every visit, no cache | TTFB of 1.2 to 2 s | LCP | Caching, static generation, CDN | 3 to 5 days |
| Banners and carousels without dimensions | Visible layout shifts | CLS | Reserved space, preloaded fonts | 1 day |
PDFs deserve special attention. They often weigh 2 to 15 MB, are poorly indexed when scanned, and some themes embed them in a viewer that slows every product page. A rich HTML page carrying the key specifications, with the PDF as a download, serves both users and search engines better.
Optimise or rebuild: comparing scenarios
It all depends on the state of the platform. A recent, well-hosted CMS can be fixed; a ten-year-old site on an overloaded theme can cost more to repair than to rebuild.
| Scenario | Budget (2026 estimate) | Timeline | Target LCP | When to choose it |
|---|---|---|---|---|
| Audit only | EUR 1,500 to 4,000 | 2 to 3 weeks | Diagnosis | Always first |
| Targeted fixes (images, scripts) | EUR 5,000 to 8,000 | 4 to 6 weeks | 2.5 to 3.5 s | Recent platform, little debt |
| Full project (cache, CDN, templates) | EUR 8,000 to 15,000 | 6 to 10 weeks | Under 2.5 s | Decent CMS, poorly configured |
| Rebuild on a modern stack | On quote | 10 to 16 weeks | 1.2 to 2 s | Obsolete platform, unmaintained plugins |
| Monthly performance maintenance | 75,000 to 120,000 FCFA per month (EUR 114 to 183) at Kolonell | Ongoing | Keep scores green | After the project |
Kolonell prices industrial site rebuilds on quote, after an audit, because page volume, ERP integrations and PDF migration change the scope considerably. A statically generated architecture serving AVIF images from a CDN typically brings LCP under 1.5 seconds, even with 3,000 product pages.
Order of priorities
Start with the 200 pages that receive 70% of organic traffic, as measured in Search Console. Handle images and caching first, which solve most of the LCP problem, then third-party scripts for INP. Leave the configurator for last: it is the riskiest workstream. Measure with field data (CrUX), not just Lighthouse, because Google ranks on the real experience of your visitors, often on factory-floor or site connections.
Mini case study
David, marketing manager of a hydraulic cylinder maker in Ohio, gets 9,000 organic visits a month with a 1.2% quote-request rate, so 108 requests. His sales team closes 15% and an average order is worth USD 4,500.
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- Audit and full project: USD 3,200 + 12,000 = USD 15,200.
- Cautious assumption: +15% traffic (10,350 visits) and request rate lifted to 1.4% thanks to faster mobile pages, so 145 requests a month.
- Gain: 37 requests × 15% × USD 4,500 = about USD 25,000 of additional orders per month.
Even dividing that estimate by three, the project pays for itself within two months of orders.
FAQ
Do Core Web Vitals really affect Google rankings?
They are one signal among many, mostly a tie-breaker between pages of similar relevance. Their main effect is commercial: beyond 3 seconds of load time, 30 to 50% of mobile visitors leave.
Should the PDFs be removed?
No, technical buyers need them. Compress them (often from 8 MB to under 1 MB), offer them as downloads, and put the key data in indexable HTML on the product page.
How long before Search Console shows the improvement?
CrUX field data is calculated over a rolling 28 days. Allow 4 to 6 weeks after release for URLs to move to "good".
Lighthouse says 95, so why is Search Console still red?
Lighthouse simulates a lab load; Search Console reflects real visitors on real devices. A gap of 1 to 3 seconds of LCP between the two is common on a heavy catalogue.
Is a rebuild mandatory?
Only if the audit shows the platform is the bottleneck, for example an unmaintained theme or saturated shared hosting. In about half of cases, a EUR 5,000 to 15,000 project is enough.
Let's scope your project. Send us your site address and a Search Console export: we will identify the causes, price the fixes by priority and propose a schedule. 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.
