The verdict in three sentences
On a 3G connection in Kampala, a 4MB site takes 12 to 18 seconds to render: half your visitors leave before they see your offer. Every added second raises the bounce rate by roughly 32% and cuts your conversions. A performance rebuild brings page weight under 1MB and LCP under 2.5s for 400,000-900,000 FCFA (about 610-1,370 EUR).
Before / after: what a rebuild changes
A heavy WordPress theme piles up scripts, fonts and uncompressed images. A rebuilt front end (Next.js, WebP/AVIF images, CDN) attacks the root cause. 2026 order of magnitude for a typical brochure site:
| Metric | Heavy site (before) | Rebuilt site (after) |
|---|---|---|
| Page weight | 4.2 MB | 780 KB |
| LCP on 3G | 12.5 s | 2.3 s |
| TTFB (via CDN) | 1.8 s | 380 ms |
| HTTP requests | 118 | 34 |
| Mobile Lighthouse score | 28 / 100 | 94 / 100 |
| Mobile bounce rate | 71% | 42% |
| Images (format) | Uncompressed JPEG | WebP/AVIF |
Image savings alone account for 60 to 80% of the weight cut: a 2.4MB gallery drops to 500KB with no visible loss.
Where to start: fix priorities
Not all optimizations are equal. Here is the profitable order, from highest impact to fine-tuning:
| Priority | Action | Estimated speed gain | Effort |
|---|---|---|---|
| 1 | Convert images to WebP/AVIF + srcset | -60 to -80% weight | Medium |
| 2 | Serve via CDN (TTFB) | -1 to -1.4 s | Low |
| 3 | Lazy-load below the fold | -30% initial requests | Low |
| 4 | Remove unused scripts/plugins | -0.5 to -2 s | Medium |
| 5 | Preload hero image + font-swap | -0.8 s LCP | Low |
| 6 | Rebuild the front end (Next.js) | Durable foundation | High |
Starting with images and the CDN delivers 70% of the result for 20% of the effort.
Mini case study
Modibo runs a travel agency in Kampala. His WordPress site weighs 4.1MB and loads in 13s on 3G; it gets 3,200 mobile visits a month with a 70% bounce. After a 650,000 FCFA rebuild (weight 720KB, LCP 2.2s), his bounce falls to 43%. Retained visitors rise from 960 to 1,824 a month. At a 4% contact rate he goes from 38 to 73 quote requests monthly: the rebuild pays for itself in under two months.
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FAQ
How much does a performance rebuild cost in 2026?
For a brochure site, budget 400,000-900,000 FCFA depending on page count and animation complexity. An online store costs more because of the catalog.
Why does 3G change everything?
A large share of West and East African traffic arrives over 3G or congested 4G. A site tuned for fiber can take 15s on 3G: you optimize for the worst case, not for your office.
Will I lose my current design?
No. We keep the visual identity and rebuild the technical foundation underneath. The result can even be truer to the design because it is better controlled.
Is WebP compatible with all phones?
Yes, every modern browser reads it, and AVIF saves another 20%. We serve a JPEG fallback for the rare old devices.
What LCP should I target?
Under 2.5s on throttled 3G. That is the threshold where Google rates the experience as good and where bounce stabilizes.
Let's talk about your project. We audit your site's speed on 3G and quote the rebuild within 48 hours. 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.
