The verdict in three sentences
In Nigeria as across West Africa, your typical shopper browses on an entry-level smartphone over 3G, on a data plan billed at around 500 FCFA per GB. A slow catalog is not a technical detail: every second of delay shaves off roughly 7 % of conversion and drains your average basket. The absolute 2026 priority: WebP images, lazy load, controlled pagination and PWA caching to hit a page under 1 MB and an LCP below 2.5 s.
Why page weight decides your sales
A visitor paying for data does not forgive a 4 MB page that takes 12 seconds to render. They leave before even seeing your products. The challenge is twofold: perceived speed (content shows fast) and data savings (the buyer does not feel robbed).
| Technical lever | Typical 2026 gain | Effect on the buyer |
|---|---|---|
| WebP vs JPEG image | -70 % weight | Data preserved, fast load |
| Lazy-loaded visuals | -40 to -60 % first screen | Lower LCP, smooth scroll |
| Pagination (24/page) | Page < 1 MB | No stalls on 3G |
| Offline PWA cache | Near-instant re-visit | Loyalty, repeat purchase |
| Local/regional CDN | -100 to -300 ms latency | Less wait on tap |
These orders of magnitude (2026 estimate) stack up: a store going from 4 MB to 900 KB sees its mobile bounce rate collapse.
Pagination or infinite scroll: the real trade-off
Infinite scroll is tempting but risky on expensive data: it loads dozens of images the buyer will never see and blows up their consumption. Classic pagination (or a "Load more" button fired on demand) protects the data plan and keeps every page under the 1 MB line.
| Approach | Data used | Fit for 3G? |
|---|---|---|
| Auto infinite scroll | High (loads all) | No |
| "Load more" button | Controlled (on demand) | Yes |
| Pagination 24/page | Low and predictable | Yes, ideal |
| Grid + filters | Targeted to need | Yes |
Mini case study
Chidi, who runs a ready-to-wear shop in Lagos, sells a 180-item catalog online. Her old site loaded 3.8 MB per page (full-size JPEGs, infinite scroll). On 1,000 mobile visitors a month she converted at 1.2 %, i.e. 12 sales at a 22,000 FCFA average basket = 264,000 FCFA/month.
After a rebuild (WebP, lazy load, pagination 24, PWA), the page dropped to 850 KB and LCP from 6.1 s to 2.2 s. Conversion rose to 1.9 %, i.e. 19 sales = 418,000 FCFA/month. Net gain: +154,000 FCFA per month for an identical catalog, purely from performance.
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
FAQ
Is WebP compatible with every phone?
Yes, all common mobile browsers in 2026 (Chrome, recent Opera Mini, Samsung Internet) read WebP. We keep an automatic JPEG fallback for the rare old device, without penalizing everyone else.
How many photos per product on mobile?
Three to five is enough: one crisp hero, two detail shots, one in-context. Beyond that you bloat the page with no notable conversion gain; extra visuals lazy-load on demand.
Is a PWA really useful in West Africa?
Yes: the PWA caches the catalog and enables near-instant re-visits, even on an unstable connection. That is a major edge when 60 to 80 % of traffic is mobile and often on 3G.
Do I need a CDN for a small shop?
As soon as you target several cities or countries, yes. A regional CDN cuts latency by 100 to 300 ms per request, which is noticeable on tap over a slow link.
How much does a catalog optimization cost?
On an existing store, a performance pass usually runs from 300,000 to 700,000 FCFA depending on product volume (2026 order of magnitude). Payback is measured in weeks given the conversion lift.
Let's talk about your project. We audit your catalog and make it fast even on 3G. 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.
