The verdict in three sentences
On a 3G network in Thiès, optimizing the checkout pays more than acquisition: every extra second of latency drives away customers who had already decided to buy. Past 3 seconds of latency, 40% of carts are abandoned. Cutting the tunnel to 2 fields + a Wave deep link instead of 5 fields and a redirect wins ≈ 12 conversion points.
5-field checkout vs 2 fields + deep link
Form length and payment mode weigh directly on completion rate. Here is the comparison observed in Thiès in 2026.
| Element | 5-field checkout + redirect | 2-field checkout + Wave deep link |
|---|---|---|
| Fields to fill | 5 | 2 |
| Load time (3G) | 4.5 s | < 2.5 s |
| Checkout page weight | 1.2 MB | < 500 KB |
| Completion rate | 50% | 62% |
| Abandonment at 3 s+ latency | 40% | 22% |
| Conversion gain | baseline | +12 points |
The Wave deep link opens the customer's payment app directly instead of routing them through a slow redirect page: it's the single most powerful mobile lever.
The 2026 offline-first playbook
Optimizing for 3G means budgeting performance like you budget costs. Here are the technical targets (2026 order of magnitude).
| Metric | 2026 target | Why |
|---|---|---|
| 3G load time | < 2.5 s | Customer tolerance threshold |
| Checkout page weight | < 500 KB | Speed on limited data |
| Number of fields | 2 | Less friction |
| Mobile completion rate | 62% (vs 71% desktop) | Close the gap |
| Average basket | 18,000 FCFA | Gain calculation base |
| Abandonment at 3 s+ | 22% after optimization | Versus 40% before |
Concretely: WebP/AVIF images, lazy loading, deferred JS, Wave-number autofill, and address pre-fill via geolocation. The goal is a checkout usable even when the network drops to 200 Kbit/s.
Mini case study
Moussa sells sporting goods in Thiès, 1,200 checkout sessions/month, average basket 18,000 FCFA, 85% mobile 3G traffic. His old tunnel (5 fields + redirect) converts at 50%, i.e. 600 sales. After an offline-first rebuild (2 fields + Wave deep link, page < 500 KB), he reaches 62%, i.e. 744 sales. Gain: +144 sales/month × 18,000 = 2,592,000 FCFA additional monthly revenue, without spending a single franc more on ads. The optimization cost less than one month of that gain.
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FAQ
Why does 3G change everything at checkout?
Because past 3 seconds of latency, 40% of customers abandon. A 1.2 MB checkout page taking 4.5 s to load on 3G loses half of already-decided buyers. Targeting < 2.5 s and < 500 KB is vital.
Is the Wave deep link really worth 12 points?
Yes: by opening the customer's Wave app directly instead of a redirect page, it removes the slowest, most-abandoned step of the tunnel, raising completion from 50% to 62%.
How many fields maximum?
Two are enough on mobile: name and phone, with the rest pre-filled (address via geoloc, Wave number via autofill). Each removed field cuts friction and typing time on a touch keyboard.
Is optimization more profitable than ads?
Often yes: gaining 12 conversion points on existing traffic costs once, while acquisition pays for every visitor. In Moussa's case, optimization brings 2,592,000 FCFA/month with no extra media budget.
How do I test real 3G performance?
By simulating a throttled network at ≈ 400-750 Kbit/s in dev tools, then testing on a real phone in Thiès at peak hour. Dakar Wi-Fi tests hide the real field latency problems.
Let's talk about your project. We audit and optimize your offline-first mobile checkout to win conversion points on 3G networks. 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.
