The verdict in three sentences
In Johannesburg, 26 % of buyers abandon because of slowness in the checkout funnel on 3G. A classic checkout takes 95 seconds; a 3G-optimized checkout drops to 28 seconds and gains 13 % conversion. Three levers are enough: a single page, one-tap mobile-money payment, and slimmed pages under 500 KB.
Classic checkout versus 3G checkout
The classic funnel multiplies steps and kilobytes; the 3G checkout compresses them. On a slow network, the difference is counted in lost sales.
| Criterion | Classic checkout | 3G-optimized checkout |
|---|---|---|
| Total time | 95 s | 28 s |
| Steps | 4 pages | 1 page |
| Page weight | > 1.5 MB | < 500 KB |
| Payment | multi-screen redirect | mobile money one-tap |
| LCP | > 5 s | < 2.5 s |
| Conversion | baseline | +13 % |
The 3G checkout is not a luxury: in a slow-connection market, it turns speed directly into revenue.
The technical levers that save seconds
Each optimization removes a concrete obstacle. Here are the 2026 estimated gains per lever.
| Lever | Time gain / effect | Priority |
|---|---|---|
| Single page (vs 4 pages) | -40 s | high |
| Mobile money one-tap | +9 conversion points | high |
| Address autofill | -20 s | high |
| Pages < 500 KB | LCP < 2.5 s | high |
| WebP/AVIF images | -30 % weight | medium |
| Average basket | 23,000 FCFA | (context) |
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One-tap mobile-money payment alone adds 9 conversion points: it's the most fragile moment of the funnel, where slowness does the most damage.
Mini case study
Parfait sells sports gear in Johannesburg: 1,000 visits/month, classic 95 s checkout, 1.4 % conversion (14 sales) at 23,000 FCFA, i.e. 322,000 FCFA. He moves to a single-page checkout, under 500 KB, with address autofill and one-tap mobile money. The funnel drops to 28 s, conversion gains 13 % relative plus the 9 points from one-tap payment. Conversion reaches ~1.7 %, i.e. 17 sales and 391,000 FCFA: +69,000 FCFA per month without a franc more of advertising.
FAQ
Is a single checkout page reliable? Yes, it's even the norm on slow mobile. Grouping address, delivery and payment on one page removes 40 seconds and eliminates between-step abandonment.
Why target under 500 KB per page? On 3G, each 100 KB adds loading seconds. Under 500 KB, LCP drops below 2.5 s, the threshold beyond which 26 % of buyers drop off.
How does one-tap mobile money work? The customer validates payment without leaving the page, via a single code. This shortcut adds 9 conversion points by removing the multi-screen redirects that lose the buyer.
Is address autofill worth the effort? Absolutely: it saves about 20 seconds of typing on mobile. Less typing on 3G means fewer drop-offs and a funnel that stays under 30 seconds.
Let's talk about your project. We build a single-page checkout, under 500 KB, with one-tap mobile money. 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.
