The verdict in three sentences
A Core Web Vitals audit runs 1,500 to 4,000 EUR in Montreal in 2026, a full technical rebuild 6,000 to 18,000 EUR depending on accumulated debt. The return is measurable: every second saved on LCP improves conversion by 5 to 10% and bounce rate drops mechanically. Google factors these metrics into ranking, so performance serves UX, SEO and revenue at once.
What the audit and rebuild cost
Web performance rests on three signals: LCP (how fast the main content shows), INP (responsiveness to interactions) and CLS (visual stability). An audit finds the bottlenecks; the rebuild fixes them. Here are the 2026 Montreal ranges.
| Service | 2026 price (EUR) | Content |
|---|---|---|
| Express performance audit | 1,500 - 2,500 | LCP/INP/CLS diagnosis, action plan |
| Deep audit + roadmap | 2,500 - 4,000 | Profiling, ROI prioritization, budget |
| Image & font optimization | 1,200 - 3,000 | WebP/AVIF, lazy-load, preload |
| Front-end technical rebuild | 4,000 - 10,000 | Code splitting, hydration, cache |
| Migration to fast stack | 6,000 - 18,000 | Next.js/Astro, CDN, edge |
| Monthly performance monitoring | 350 - 900 /mo | Monitoring, alerts, fixes |
For a 40-page Montreal B2B site with average technical debt, budget 8,000 to 14,000 EUR to turn every key URL green on all three metrics.
Before/after figures
Numbers beat promises. Here are 2026 orders of magnitude observed after optimization on comparable B2B sites.
| Metric | Before | After | Impact |
|---|---|---|---|
| LCP | 4.2 s | 1.8 s | +12% conversion |
| INP | 320 ms | 140 ms | -18% bounce |
| CLS | 0.28 | 0.04 | +6% pages/session |
| Mobile PageSpeed score | 42 | 91 | Better SEO crawl |
| Organic traffic 6 months | base | +22% | Improved ranking |
| Conversion rate | 1.8% | 2.3% | +28% relative |
A B2B site going from 42 to 91 on mobile typically sees organic traffic rise 15 to 25% over six months, the combined effect of better crawl and better engagement.
Realistic timelines
Targeted optimization (images, fonts, cache) fits in 2 to 3 weeks. A full front-end rebuild takes 6 to 10 weeks. A stack migration to Next.js or Astro spans 8 to 16 weeks depending on content volume and integrations. Monthly monitoring prevents regression: without it, an optimized site degrades again within 6 to 12 months from marketing additions (scripts, tags, pop-ups).
Mini case study
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
Thomas runs an industrial trading SME in Montreal whose site generates 60 leads a month at a 1.8% conversion rate. His mobile LCP is 4.2 s. He invests 11,000 EUR in a front-end rebuild plus image optimization, dropping LCP to 1.8 s and lifting conversion to 2.3%. On the same traffic he goes from 60 to 77 leads a month, 17 extra leads. At an average margin of 2,500 EUR per signed deal and a 12% close rate, that is about 61,000 EUR of additional annual margin. The investment pays back in under three months.
FAQ
How much does a Core Web Vitals audit cost in 2026?
Between 1,500 and 4,000 EUR depending on depth. An express audit is enough to prioritize; a deep audit prices each fix and its expected ROI.
Do I have to change technology?
No. In 60% of cases, optimizing images, fonts and cache is enough to go green for 2,000 to 4,000 EUR. A stack migration is only justified with heavy structural debt.
How long to see the SEO impact?
Expect 3 to 6 months for a clear effect on organic traffic, the time Google needs to recrawl and reassess. The conversion impact is immediate at launch.
Is the PageSpeed score what really matters?
The score is an indicator, but field metrics (real CrUX visitor data) are what weigh in ranking. A good provider optimizes field data, not just the lab score.
Does performance degrade over time?
Yes, every added marketing script weighs the site down. Monthly monitoring at 350-900 EUR protects the investment and avoids a full re-optimization every two years.
Let's scope your project. Send us your site URL and conversion goals, and we deliver a priced express audit and a ROI-prioritized action 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.
