The verdict in three sentences
For B2B e-commerce, speed is not a technical topic but a revenue line: every 100 ms of LCP saved is worth 1 to 2 % more conversion. In Montreal in 2026, a performance optimization costs 3,500 to 9,500 CAD and ships in 3 to 5 weeks. The ROI is calculated precisely per speed tier using field data (CrUX, RUM).
The speed-conversion relationship, quantified
The correlation between load time and conversion is robust and documented. Here are 2026 orders of magnitude for B2B e-commerce.
| Measured LCP | Relative conversion | Revenue impact (base 100) |
|---|---|---|
| < 1.5 s | High reference | 100 |
| 2.0 s | -3 to -5 % | 95 - 97 |
| 2.5 s | -6 to -10 % | 90 - 94 |
| 3.5 s | -14 to -20 % | 80 - 86 |
| 5.0 s | -25 to -35 % | 65 - 75 |
A site at 3.5 s therefore leaks 14 to 20 % of conversions versus a fast site. On significant online revenue, each tenth of a second recovered translates into concrete dollars.
Optimization budget and line items
The quote depends on the CMS, page count and technical debt. Here are the 2026 Montreal ranges.
| Line item | 2026 cost (CAD) | Measured effect |
|---|---|---|
| RUM + CrUX audit | 700 - 1,700 | Field diagnosis |
| Image optimization + CDN | 150 - 450/month | -30 to -50 % LCP |
| Critical front-end rework | 2,000 - 5,500 | INP + LCP into green |
| Cache + server optimization | 1,100 - 2,800 | TTFB halved |
| 90-day tracking | Included | ROI validation |
Field measurement (RUM, CrUX) is essential: lab tests (local Lighthouse) overstate the real performance seen by your actual visitors, often on more modest connections and devices.
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Mini case study
Elodie, e-commerce lead at an electronic-components SME in Montreal, has a site with 3.6 s LCP and 300,000 CAD in monthly online revenue. She invests 7,500 CAD to drop to 1.9 s. The estimated conversion gain, tier 3.6 s to 1.9 s, is around +14 %. Applied to 300,000 CAD, that is about 42,000 CAD of extra monthly revenue — the optimization pays back in under a week of additional revenue, with a recurring CDN budget of 300 CAD/month.
FAQ
What is 100 ms of extra speed worth? As a 2026 order of magnitude, 1 to 2 % conversion per 100 ms of LCP saved on B2B e-commerce. The effect is stronger on mobile.
How much is an optimization in Montreal? Between 3,500 and 9,500 CAD in 2026 depending on technical debt, plus 150 to 450 CAD/month for CDN and images.
Why measure with RUM rather than Lighthouse? RUM reflects your real visitors' experience (real devices, networks). Local Lighthouse often overstates performance by 20 to 40 %.
How long does it take? Expect 3 to 5 weeks, including a week of field audit and 90-day tracking to validate ROI.
Is the gain durable? Yes if maintained. A new heavy feature or unoptimized images can degrade LCP; quarterly tracking protects the investment.
Let's scope your project. Share your current LCP and monthly online revenue: we'll price the optimization and project ROI per speed tier. 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.
