The verdict in three sentences
In 2026, on African 3G networks, each second of load beyond 3 s costs about 7 % of conversion. With 68 % of traffic on mobile 3G/4G, the payment page must be treated as a critical asset, not a technical detail. Cutting weight, removing third-party scripts, and limiting redirects wins sales directly.
The thresholds that matter
Speed is not measured by feel but by precise metrics. Here are the targets to hold on a 2026 checkout page.
| Metric | 2026 target | Impact if exceeded |
|---|---|---|
| LCP (Largest Contentful Paint) | < 2.5 s | -7 % conversion / s |
| TTFB (Time To First Byte) | < 600 ms | Delayed render |
| Checkout page weight | < 400 KB | Slow load on 3G |
| Third-party scripts | <= 2 | Render blocking |
| Redirects before payment | <= 1 | +1 to 2 s each |
| Time to Interactive (TTI) | < 4 s | Lost clicks |
LCP < 2.5 s is the queen metric: beyond it, conversion drops linearly, about 7 relative points lost per extra second.
What weighs a payment page down
The culprits are almost always the same: analytics and chat scripts not essential to checkout, heavy fonts, uncompressed images, and cascading redirects. Here is the measured effect of a cleanup.
| Optimization | Weight saved | Conversion effect |
|---|---|---|
| Removing 3 third-party scripts | -180 KB | +9 % sales |
| WebP/AVIF images | -120 KB | LCP -0.8 s |
| System font instead of custom | -90 KB | Render +0.5 s |
| Single payment redirect | -1.5 s | -6 % abandonment |
| Lazy-load off checkout | -60 KB | TTI -0.7 s |
Removing non-essential third-party scripts on the payment page is the highest-yield move: -180 KB for +9 % sales, without touching the design.
Mini case study
Christelle runs an accessories store in Lagos also serving Abidjan, 800 checkout sessions per month, average cart 11,000 FCFA, 40 % conversion, i.e. 320 sales. Her page loads in 5.2 s. Bringing it to 2.4 s (script removal, WebP, single redirect), she recovers about +9 % of sales.
That is 29 more sales per month, or 319,000 FCFA of extra revenue, purely from performance, with no ad spend.
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Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
The Kolonell referral program pays for every project you bring. 2026 scale: 15 % + 5 % recurring on a showcase site, 12 % on e-commerce, 10 % on a marketplace, 8 % on institutional. A store rebuilding its high-performance checkout on a 2,000,000 FCFA e-commerce project earns you 240,000 FCFA.
FAQ
How much does a second of checkout slowness cost?
About 7 % relative conversion per second beyond 3 s on 3G. On a 5 s page, that can mean 15 to 20 % of lost sales.
What is the maximum weight for a payment page?
Aim for under 400 KB, with LCP below 2.5 s and TTFB under 600 ms. Beyond that, the 3G experience degrades sharply.
Which scripts should be removed from checkout?
All those not essential to the transaction: chat, heavy analytics, social widgets. Removing 3 third-party scripts lifted sales by +9 %.
Do payment redirects really slow things down?
Yes, each redirect adds 1 to 2 seconds. Limiting to a single redirect before payment cuts abandonment by about 6 %.
Does performance matter more than design?
On mobile 3G, yes for conversion: 68 % of traffic is mobile and speed-sensitive. A beautiful slow checkout converts less than a plain fast one.
Let's talk about your project. We optimize your payment page for 3G and recover sales lost to slowness. 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.
