The verdict in three sentences
A Core Web Vitals performance audit for a Miami B2B site costs in 2026 between USD 1,800 and 5,000, excluding the fixes themselves. Bringing an LCP from 4.8 s down to under 2.5 s (plus INP < 200 ms and CLS < 0.1) typically wins 8 to 20% more measured conversions. On a site already generating revenue, the audit pays for itself within weeks.
What the audit covers and its price
A serious audit is not just a Lighthouse score: it measures real field data (CrUX), pinpoints bottlenecks and prices the fixes. Here is the 2026 breakdown for a Miami B2B e-commerce site.
| Service | Contents | 2026 price |
|---|---|---|
| Express audit | Score + 5-8 prioritised recommendations | USD 1,800-2,600 |
| Full audit | CrUX field data, waterfall, costed action plan | USD 3,000-5,000 |
| Image optimisation (AVIF/WebP) | Compression, modern formats, srcset | USD 900-2,200 |
| Lazy loading + code splitting | Deferred loading, lighter bundles | USD 1,200-3,000 |
| Cache & CDN | Edge caching, headers, preloading | USD 800-2,200 |
| Before/after QA & measurement | Proof of gain | USD 600-1,300 |
These figures are a 2026 order of magnitude; the fix budget depends on the site's starting state.
The targets to hit and the associated gain
Google's 2026 thresholds remain clear: a site rated "good" on all three metrics converts better and is crawled better. Here are the targets and the observed business impact.
| Metric | "Good" threshold | Common finding | Estimated conversion gain |
|---|---|---|---|
| LCP (loading) | < 2.5 s | 4.0-5.0 s | +5 to +12% |
| INP (interactivity) | < 200 ms | 300-500 ms | +3 to +8% |
| CLS (visual stability) | < 0.1 | 0.2-0.35 | +2 to +5% |
| Average page weight | < 1.5 MB | 3-5 MB | — |
| Time to First Byte | < 800 ms | 1.2-2.0 s | — |
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Mini case study
Mark, e-commerce lead at a Miami B2B distributor, does USD 460,000 in online revenue at a 1.4% conversion rate. His LCP sits at 4.8 s. He pays for a full audit at USD 3,400 then USD 4,200 of fixes (AVIF images, lazy loading, CDN). LCP drops to 2.1 s; conversion rises to 1.62%, i.e. +16%. On his volume, that is roughly +USD 74,000 in annual revenue: the USD 7,600 invested is recouped in under a month of gains.
FAQ
Is a good Lighthouse score enough? No: Lighthouse is a lab test. Google ranks on CrUX field data, measured on your real visitors. A serious audit cross-references both.
Does performance really affect SEO? Yes: Core Web Vitals are a ranking signal, and above all a fast site cuts bounce rate and improves crawl. The strongest effect remains on conversion.
How much are the fixes, not just the audit? Expect USD 2,200 to 9,000 depending on scope (images, lazy loading, cache, heavy-component rework). The audit prices that budget precisely.
How soon do you see the gain? CrUX field metrics update over a rolling 28 days; the conversion gain itself shows in analytics as soon as fixes go live.
Do you have to rebuild the site? Rarely: 80% of gains come from targeted optimisations (images, JS, cache) without a rebuild. The audit will say whether a partial rebuild is warranted.
Let's scope your project. Send us the URL and your current metrics (LCP, conversion rate, online revenue): we will price the audit and expected gain. 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.
