The verdict in three sentences
A full Core Web Vitals optimization for a company website in Dublin costs between 3,000 and 9,000 EUR in 2026, depending on the starting technical state. Reaching LCP < 2.5 s, INP < 200 ms and CLS < 0.1 lifts conversions by 10 to 25 %. The quick wins (WebP/AVIF images, CDN, lazy loading) deliver 70 % of the gain for 30 % of the budget.
The three metrics and their targets
Google judges performance on three signals. Each has a precise "green" threshold and a dominant optimization lever.
| Metric | 2026 "green" target | What it measures | Main lever |
|---|---|---|---|
| LCP | < 2.5 s | Largest element render | Images + CDN + server |
| INP | < 200 ms | Interaction responsiveness | Optimized JavaScript |
| CLS | < 0.1 | Visual stability | Fixed media dimensions |
| TTFB | < 800 ms | Server response | Hosting + cache |
| Page weight | < 1.5 MB | Total downloaded volume | Asset compression |
Even on Dublin's solid networks, mobile users on the move penalise heavy pages. Page weight and LCP stay the priorities: a 4 MB site frustrates users and Google alike.
Optimization line items and budget
The quote depends on page count and technical debt. Here are the 2026 ranges seen in Dublin.
| Line item | 2026 cost (EUR) | Typical gain |
|---|---|---|
| WebP/AVIF image conversion | 400 - 1,200 | -40 to -60 % weight |
| CDN setup | 80 - 250/month | -30 to -50 % LCP |
| JavaScript optimization | 900 - 2,500 | INP into green |
| Server cache + hosting | 500 - 1,400 | TTFB < 800 ms |
| Full Lighthouse audit | 500 - 1,200 | Roadmap |
A CDN at 80-250 EUR/month is the best cost-to-gain ratio for a site serving international visitors: it moves files closer to the user and halves LCP.
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Mini case study
Sarah, marketing lead at a logistics firm in Dublin, starts from a mobile Lighthouse score of 34/100, LCP at 5.8 s. She invests 4,500 EUR: image conversion (1,000), CDN (150/month), JS optimization (2,300) and audit (1,050). After 3 weeks, LCP drops to 2.2 s and the score hits 88/100. Her form conversion rate climbs from 3.1 % to 3.8 %, a +22 % lift. On 900 qualified monthly visitors, that means 6 extra quote requests per month — the investment pays back in under 2 months.
FAQ
How much is a full optimization? Between 3,000 and 9,000 EUR in 2026 depending on technical debt. A recent, well-built site sits at the low end.
Is a CDN really worth it? Yes, decisive. It cuts LCP by 30 to 50 % for a site with a distributed audience, for 80-250 EUR/month.
What conversion gain to expect? As a 2026 order of magnitude, 10 to 25 % depending on the starting point. The slower the site starts, the more spectacular the gain.
How long does the work take? Expect 2 to 4 weeks for a full optimization, including a week of audit and quick-win prioritisation.
WebP or AVIF? AVIF compresses better (-20 % vs WebP) but WebP is universally supported. In 2026 you often serve both with fallback, for a weight gain of 40 to 60 %.
Let's scope your project. Send us your URL and current Lighthouse score: we'll price the priority quick wins and the CDN budget matched to your traffic. 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.
