The verdict in three sentences
A Core Web Vitals audit measures the three signals Google uses to judge experience: LCP (render speed), INP (responsiveness) and CLS (visual stability). It costs $1,000-2,800 in 2026 and produces a prioritized action plan, fixable in 2-4 weeks. On a slow B2B site, the fixes (AVIF images, lazy load, CDN) often deliver +5 to +15 % conversion and a lift in rankings.
What the audit measures and what it costs
The audit combines field data (CrUX, real users) and lab data (Lighthouse). Here are the 2026 thresholds and price ranges by depth.
| Metric | Good | Needs work | Poor |
|---|---|---|---|
| LCP | < 2.5 s | 2.5-4 s | > 4 s |
| INP | < 200 ms | 200-500 ms | > 500 ms |
| CLS | < 0.1 | 0.1-0.25 | > 0.25 |
| Audit type | Price 2026 | Deliverable | |
| Express audit | $1,000-1,500 | Report + top 10 fixes | |
| Standard audit | $1,500-2,100 | Detailed report + costed roadmap | |
| Deep audit | $2,100-2,800 | Audit + field tests + support |
Optimization plan and expected gains
The most profitable fixes focus on images, deferred loading and CDN distribution. Here is the typical impact on a New York B2B site.
| Lever | Effort | LCP gain | Business impact |
|---|---|---|---|
| AVIF/WebP images | Low | -0.8 to -1.5 s | Bounce -10 % |
| Lazy load + preconnect | Low | -0.3 to -0.7 s | INP improved |
| CDN + edge cache | Medium | -0.5 to -1.2 s | Global speed |
| Cut third-party JS | Medium | -0.4 to -0.9 s | INP < 200 ms |
| SSG/ISR key pages | High | -1 to -2 s | Conversion +5-15 % |
An LCP brought from 4.5 s to 2.0 s, combined with INP under 200 ms, improves eligibility for a "good" Core Web Vitals score, a confirmed Google ranking factor.
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Mini case study
Rachel, B2B e-commerce director at an equipment distributor in New York, sees -18 % organic traffic over 6 months and a 4.6 s mobile LCP. She orders a standard audit at $1,900. The plan prioritizes AVIF images, CDN and removing two third-party scripts; fixes delivered in 3 weeks for $4,200. Result: LCP at 1.9 s, INP at 160 ms. The site does $290,000 in online revenue; an 8 % conversion lift adds +$23,200/year for a total $6,100 investment paid back in under 4 months.
FAQ
Does an audit guarantee better Google rankings? No guarantee, but Core Web Vitals is an official ranking signal. Fixing an LCP > 4 s improves experience and often ties a ranking lift to a 5-15 % conversion gain.
How long to apply the fixes? 2-4 weeks in general, depending on the number of levers. Image and lazy-load gains are fast; SSG/ISR on key pages needs more development.
What is the difference between LCP, INP and CLS? LCP measures how fast the main content renders, INP measures responsiveness to interactions, CLS measures visual stability. All three must be "good" for an optimal Core Web Vitals score.
Do I need to rebuild the site to improve performance? Not always. Many sites gain 1-2.5 s of LCP through simple optimizations (images, cache, CDN) without a rebuild. A rebuild is only warranted when technical debt is too heavy.
How often should I audit? Once a year, plus a check after every major change (new heavy page, new marketing script). Monthly CrUX monitoring catches regressions early.
Let's scope your project. Give us the URL to audit, your CMS and your budget ($1,000-2,800 for the audit, $2,200-6,500 for the fixes): we deliver a prioritized report and a costed plan. 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.
