The verdict in three sentences
For sites serving markets with congested mobile networks, speed on mobile is a commercial issue: a majority of visits happen on 3G/4G. A performance audit costs 800,000 to 2,000,000 FCFA and image/CDN optimization 1,500,000 to 4,000,000 FCFA, over 3-5 weeks. Target: LCP < 2.5s on 4G and a bounce rate down 15-25%.
Why performance is critical on mobile networks
A site built for European fiber collapses on a congested mobile connection: uncompressed images, third-party scripts, no regional CDN. Every extra second of load time drives prospects away and hurts a corporate brand. Performance is therefore as much about credibility as SEO.
| Lever | 2026 cost (FCFA) | Before | After | Priority |
|---|---|---|---|---|
| WebP/AVIF image compression | 400,000 - 900,000 | LCP 6.2s | LCP 3.8s | high |
| CDN with regional PoP | 700,000 - 1,800,000 | TTFB 1,900ms | TTFB 420ms | high |
| Third-party script reduction | 500,000 - 1,200,000 | INP 480ms | INP 190ms | high |
| Lazy-load + preload | 300,000 - 700,000 | LCP 3.8s | LCP 2.4s | medium |
| Server caching | 400,000 - 900,000 | TTFB 420ms | TTFB 210ms | medium |
The 2026 figures are an order of magnitude and depend on page and media volume.
Measured business impact on 4G
Performance translates directly into business indicators. Here are typical gains from a corporate optimization job.
| Indicator | Before | After | Change |
|---|---|---|---|
| LCP on 4G | 6.2s | 2.4s | -61% |
| Mobile bounce rate | 68% | 49% | -19 pts |
| Pages per session | 1.9 | 3.1 | +63% |
| Average session duration | 48s | 1m 42s | +112% |
| Contact requests/month | 22 | 41 | +86% |
Mini case study
Anna is digital director of an agri-industrial group. Her corporate site loads in 6.2s on 4G and shows 68% mobile bounce. She invests 1,400,000 FCFA in the audit and 3,200,000 FCFA in optimization, totaling 4,600,000 FCFA. After the job, LCP drops to 2.4s, bounce to 49% and contact requests rise from 22 to 41/month. At a 3% conversion to sales meetings and a 4,500,000 FCFA average B2B deal, the investment pays back on a single signed contract.
FAQ
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
Why target 4G and not fiber?
Because most visitors browse on mobile, often on congested networks. Optimizing for 4G guarantees a decent experience for everyone, including fiber users.
Is a CDN really useful for these markets?
Yes: without a regional point of presence, every request travels thousands of kilometers. A CDN with regional cache often cuts TTFB by three or four times.
Is image weight the number-one problem?
In most cases yes. Uncompressed multi-MB visuals drag down LCP. Converting to WebP/AVIF is the highest-ROI lever.
How long does a performance job take?
From 3 to 5 weeks depending on the number of pages and templates. The audit takes 1 week, optimization 2-4 weeks.
Do I need a maintenance retainer?
Recommended: performance debt returns with each content addition. A quarterly check (300,000-600,000 FCFA) preserves the gains.
Let's scope your project. Send us the URL, CMS and your mobile speed targets, and we'll quote an audit and optimization prioritized for constrained networks. 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.
