The verdict in three sentences
For an industrial website in Toronto with a 5.8 s LCP and a 420 ms INP on mobile, a Core Web Vitals audit costs between USD 2,000 and 3,850 (EUR 1,800 to 3,500) and fixes between USD 4,400 and 9,900 (EUR 4,000 to 9,000). Three workstreams deliver most of the gain: switching images to AVIF, deploying a CDN and removing unnecessary third-party scripts (14 in our example). Once LCP is under 2.5 s, comparable B2B sites record +18 to +27% quote requests after 3 months.
Reading the three metrics without jargon
Google measures real visitor experience over a rolling 28 days. For a buyer browsing your laser-cut parts catalogue on a phone at a job site or a trade show, every second counts.
| Metric | What it measures | Google "good" threshold | Current site value | Target after fixes |
|---|---|---|---|---|
| LCP (Largest Contentful Paint) | Display of the largest visible element | Under 2.5 s | 5.8 s | 2.0 to 2.3 s |
| INP (Interaction to Next Paint) | Responsiveness after a click or input | Under 200 ms | 420 ms | 120 to 180 ms |
| CLS (Cumulative Layout Shift) | Visual stability of the page | Under 0.1 | 0.24 | Under 0.05 |
| Homepage weight | Data downloaded | Under 1.5 MB advised | 7.2 MB | 1.1 to 1.4 MB |
| Third-party scripts loaded | Tags, chats, pixels, widgets | As few as possible | 23 | 9 |
| Mobile PageSpeed score | Lab summary | 90 and above | 31 | 85 to 95 |
High CLS often comes from the cookie banner and product carousels pushing content down while loading.
Audit and fix pricing
| Service | Range | Turnaround | Deliverable |
|---|---|---|---|
| Express audit (10 page templates) | USD 2,000 | 1 week | Prioritised report, quick wins |
| Full audit (catalogue, configurator, forms) | USD 3,850 | 2 weeks | Report, CrUX field data analysis, costed action plan |
| AVIF conversion and resizing | USD 880 to 1,980 | 3 to 5 days | 1,200 optimised images |
| CDN and caching setup | USD 660 to 1,650 | 2 to 3 days | Server response under 200 ms |
| Third-party script clean-up (14 removed) | USD 990 to 2,200 | 1 week | Streamlined tag manager |
| JavaScript and configurator rework | USD 1,320 to 3,300 | 1 to 2 weeks | INP under 200 ms |
| CLS fixes (banner, fonts, carousels) | USD 550 to 770 | 2 days | CLS under 0.05 |
| Total fixes | USD 4,400 to 9,900 | 3 to 5 weeks | 3-month Search Console monitoring |
The 14 removed scripts are typically: 3 inactive ad pixels, 2 heatmap tools, 1 old chat widget, social media widgets, a video player loaded on every page and duplicate external fonts.
What performance changes for sales
| 3-month measure (comparable industrial B2B sites) | Before | After |
|---|---|---|
| Mobile bounce rate | 71% | 52% |
| Pages per session | 2.1 | 3.4 |
| Web quote requests per month | 30 | 35 to 38 |
| Average position on 40 product keywords | 14.2 | 9.8 |
| Mobile share of traffic | 38% | 44% |
These results are 2026 orders of magnitude observed on industrial subcontracting websites. They depend on starting traffic volume and product page quality.
Mini case study
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Matthew, sales director of a 65-employee metal parts manufacturer in Toronto, receives 30 web quote requests a month. His conversion rate is 20%, with an average order of USD 13,200 and a 30% margin. With +20% requests after the fixes, he gains 6 requests a month: 6 × 20% × USD 13,200 = USD 15,840 of extra revenue, or USD 4,750 of margin per month. For a USD 3,850 full audit and USD 7,150 of fixes, the USD 11,000 investment is recovered in just over 2 months.
FAQ
How much does a Core Web Vitals audit cost in 2026?
Between USD 2,000 for a 10-page express audit and USD 3,850 for a full audit including field data and a costed action plan. Free tools give a score, not the causes or the priorities.
Do we need to rebuild the whole site to get under 2.5 s?
Rarely: in 8 cases out of 10, images, caching and third-party scripts are enough. A full rebuild is only justified if the CMS or theme blocks any optimisation, with a budget of USD 16,500 and up.
How long before the effect shows in Google?
Field data updates over a rolling 28 days, so allow 4 to 6 weeks for the metrics to turn green. The effect on rankings and quote requests is measured over 3 months.
Is AVIF supported by all browsers?
Yes, more than 95% of browsers in use in 2026 support it, with automatic WebP fallback. File size savings reach 40 to 60% compared with JPEG.
What happens if marketing scripts are added back later?
Each new tag can cost 100 to 300 ms of INP. A simple governance rule, technical approval before any addition and a monthly check, prevents losing the gains within 6 months.
Let's scope your project. Send us your website URL and key product pages: we price an audit at USD 2,000 to 3,850 and fixes at USD 4,400 to 9,900, delivered in 3 to 5 weeks. 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.
