The verdict in three sentences
In West Africa, speed on 3G is the number-one cause of purchase abandonment, and a PWA is the most cost-effective answer. In Lagos in 2026, a store turned into a PWA loads in under 3 seconds versus 8 to 12 seconds for a classic site, worth +20 % mobile conversion and -25 % bounce rate. The cherry on top: home-screen installation adds +40 % retention and offline mode saves the cart even with no network.
Why the PWA wins on 3G
A Progressive Web App combines the best of the web and apps: it loads in the browser but uses a smart cache (service worker) to download only what's strictly needed. On an unstable connection, the difference is dramatic.
| Criterion | Classic site | Optimized PWA |
|---|---|---|
| Load time on 3G | 8 to 12 s | < 3 s |
| Target page weight | 2 to 4 MB | < 500 KB |
| Works offline | no | yes (cache) |
| Home-screen install | no | yes |
| Retention | baseline | +40 % |
| Bounce rate | baseline | -25 % |
| Mobile conversion | baseline | +20 % |
Page weight is the crux: getting under 500 KB (WebP images, minified code, cache) is what enables loading in under 3 seconds. Every second saved directly cuts abandonment.
Cache, service worker, and offline mode
The service worker is the PWA's engine. It stores visited pages, the catalog, and the cart locally, so the customer can browse even when the network drops, a frequent situation in Lagos.
| PWA function | What it changes for the customer | Business impact |
|---|---|---|
| Cache of visited pages | Instant reload | -25 % bounce |
| Persistent offline cart | Never loses the order | Less abandonment |
| 1-tap install | Icon on home screen | +40 % retention |
| Catalog preloading | Smooth navigation | +20 % conversion |
| Push notifications (optional) | Repeat-purchase nudge | Purchase frequency |
Concretely, a customer who loses the network at checkout no longer loses their cart: the order is queued and syncs as soon as the signal returns. That's a decisive advantage where connectivity is irregular.
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Mini case study
Ngozi runs an online fashion store in Lagos. 80 % of her traffic is mobile on 3G. Her classic site loads in 10 seconds and shows a 60 % bounce rate, with mobile conversion of 1.8 % on 5 000 visitors/month, i.e. 90 sales at 9 000 NGN = 810 000 NGN/month.
She switches to a PWA: loading under 3 seconds, page weight 420 KB. Bounce falls to 45 % (-25 %) and mobile conversion rises to 2.16 % (+20 %). New result: 108 sales/month = 972 000 NGN, i.e. +162 000 NGN/month. As a bonus, 40 % of customers install the store on their home screen and return without going through search again.
FAQ
Does a PWA replace a real mobile app? For most stores, yes. A PWA installs on the home screen, works offline, and sends notifications, without the cost and delay of a native app or the app-store process. It brings +40 % retention for a fraction of the budget.
How much does turning a store into a PWA cost? Depending on the site's state, budget 500 000 to 1 500 000 NGN for the optimization (service worker, cache, WebP images, weight under 500 KB). The return comes from the +20 % mobile conversion.
Does offline mode let customers pay without a network? No, Paystack or mobile-money payment requires a connection. But the cart and browsing stay available offline, and the order syncs as soon as the signal returns, avoiding abandonment.
How do I reach under 3 seconds on 3G? By cutting page weight under 500 KB: WebP images, minified code, lazy loading, and service-worker caching. These combined optimizations divide load time by three or four.
Does a PWA improve SEO? Yes, indirectly: Google favors fast sites, and dropping under 3 seconds improves Core Web Vitals. A better speed score and a -25 % bounce strengthen your position in mobile results.
Let's talk about your project. We turn your store into a fast, offline PWA built for 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.
