The verdict in three sentences
In low-bandwidth markets, where a large majority of traffic is mobile on slow networks, a heavy site drives customers away before it even renders. A truly low-bandwidth-optimised site costs 900,000 to 2,800,000 FCFA in 2026, with page weight under 500 KB and LCP under 3 seconds. The return is direct: up to +30% mobile conversion versus a standard unoptimised site.
Price of a mobile-first site
Here are the 2026 ballpark figures by level of optimisation and features.
| Package | Price (FCFA) | Timeline | Page weight | LCP 3G |
|---|---|---|---|---|
| Essential low-bandwidth brochure | 900,000 - 1,300,000 | 4-5 wks | < 400 KB | < 2.5 s |
| Brochure + optimised blog | 1,400,000 - 2,000,000 | 5-6 wks | < 500 KB | < 3 s |
| Catalogue site + forms | 2,100,000 - 2,800,000 | 6-7 wks | < 500 KB | < 3 s |
| Monthly maintenance | 55,000 - 160,000 | - | - | - |
Maintenance covers updates, performance monitoring and backups. In a slow-connection market, it includes a monthly check on page weight, which tends to creep up as content grows.
What makes the difference on slow networks
Low-bandwidth optimisation is not a setting but a discipline applied to every component. Here is the estimated impact of each lever.
| Technical lever | Speed gain | Conversion effect |
|---|---|---|
| AVIF/WebP images | -60% image weight | +8 to 12% |
| Lazy loading | -40% on initial load | +5 to 8% |
| Regional CDN | -30% latency | +4 to 7% |
| Minimal CSS/JS | -25% code weight | +3 to 5% |
| Aggressive caching | -50% on repeat visits | +5 to 10% |
Combined, these levers achieve an LCP under 3s even on throttled 3G. Every second saved on load time translates into several conversion points on mobile.
Mini case study
Fatou, manager of a services company in a low-bandwidth market, had a heavy site (2.4 MB, LCP 7s on 3G) generating 40 quote requests/month for 3,200 visits. She rebuilds an optimised site at 1,700,000 FCFA: weight cut to 420 KB, LCP to 2.6s. Mobile conversion rises from 1.25% to 1.65% (+32%), about 53 requests/month. At 15% closing and 350,000 FCFA average order, the 13 extra requests generate roughly 680,000 FCFA additional revenue/month. The site pays back in under 3 months.
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FAQ
Why optimise for 3G in 2026?
Because a large share of mobile traffic in many markets still runs on slow or unstable networks. A site that loads in 7s loses most of its visitors before rendering; under 3s, you keep them.
What page weight should we target?
Under 500 KB for a typical page, ideally under 400 KB for the homepage. Beyond that, 3G load time becomes penalising and conversion drops.
How much does a mobile-first site cost?
Between 900,000 and 2,800,000 FCFA depending on features, plus 55,000 to 160,000 FCFA/month maintenance. Low-bandwidth optimisation adds little to cost but much to conversion.
How long to deliver?
Between 4 and 7 weeks depending on scope. An essential brochure ships in 4-5 weeks; a catalogue site with forms needs 6-7 weeks.
Does optimisation also help SEO?
Yes, strongly. Google favours fast, mobile-first sites. An LCP under 3s improves ranking and therefore organic traffic, on top of conversion.
Let's scope your project. Tell us your pages, features and mobile traffic share, and we'll price a low-bandwidth-optimised site. Detailed quote within 48 h. 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.
