The verdict in three sentences
On mobile 3G, a heavy product page with no social proof converts 3 times worse than an optimised one. The decisive levers in 2026: WebP images under 120 KB, 4 to 6 photos, load time under 2.5 seconds and a sticky CTA at the bottom of the screen. Customer reviews (+18%) and a short video (+25%) turn a decent page into one that sells.
Optimised page vs generic page
The product page is your best salesperson: it works 24/7. Here is what separates a page that converts from one that lets the buyer walk away.
| Element | Optimised page | Generic page |
|---|---|---|
| Weight per image | < 120 KB (WebP) | > 500 KB (JPEG) |
| Number of photos | 4 to 6 | 1 to 2 |
| Load time | < 2.5 s | > 5 s |
| Customer reviews | shown, verified | absent |
| Product video | short, 10-20 s | none |
| Price and fees | clear, up top | vague |
| Mobile CTA | sticky at bottom | lost in the page |
Each row moved into the left column adds cumulative conversion points.
The costed checklist to apply
| Optimisation | 2026 conversion impact |
|---|---|
| WebP images < 120 KB | load < 2.5 s |
| 4 to 6 photos, varied angles | +12% |
| Verified customer reviews | +18% |
| Short product video | +25% |
| Sticky "Add to cart" CTA | +9% |
| Price + fees shown early | -14% abandonment |
Applying even half of this checklist is often enough to double a page's conversion.
Become a Kolonell referral partner
Know merchants who need a store that actually converts? Our referral partner programme pays you for every signed project, with no technical work on your side.
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| Project type referred | Sale commission | Recurring |
|---|---|---|
| Showcase site | 15% | 5% |
| E-commerce | 12% | — |
| Marketplace | 10% | — |
| Institutional | 8% | — |
A single e-commerce project at 2,000,000 FCFA earns you 240,000 FCFA in commission. You refer, we deliver.
Mini case study
Mariama, who runs an accessories store in Dakar, had a generic page: 1 JPEG photo of 600 KB, 5.5 s load time, no reviews. On 1,000 visits/month, she converted at 0.9% (9 sales at 14,000 FCFA). After optimisation (WebP photos, 5 visuals, verified reviews, short video, sticky CTA), she reaches 2.4% conversion, i.e. 24 sales, revenue rising from 126,000 to 336,000 FCFA/month without spending a single franc more on advertising.
FAQ
What image weight should I target on mobile? Under 120 KB per image in WebP. That's what enables a page load under 2.5 seconds, the key threshold to avoid losing buyers on 3G.
How many photos per product? Between 4 and 6, from varied angles, with at least one in-context shot. A single generic photo costs about 12 conversion points.
Are customer reviews worth the effort? Yes: displayed verified reviews raise conversion by about 18%. It's the most cost-effective social proof to add.
Does a product video really change sales? A short 10-to-20-second video can add up to 25% conversion, especially for fashion, homeware or craft products.
Where should the buy button go on mobile? At the bottom of the screen, sticky and always visible. A pinned "Add to cart" CTA adds about 9 conversion points versus a button lost in the scroll.
Let's talk about your project. We'll optimise your product pages to target 2x on conversion. 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.
