The verdict in three sentences
A 5.1-second mobile LCP puts a business school website in Google's red zone and directly costs brochure requests. A Core Web Vitals audit priced at 1,500 to 3,000 EUR (about 1,650 to 3,300 USD) pinpoints the causes, and fixes of 4,000 to 9,000 EUR usually bring LCP under 2.5 s and INP under 200 ms. Since each lost second can cut conversion by roughly 23 %, the investment often pays back within a single recruitment cycle.
Diagnosis: what the audit measures
Core Web Vitals are three metrics measured on real visitors (CrUX data) that Google uses in ranking. For a school whose traffic is 80 % mobile, mobile values are what count. In Singapore, where international applicants browse from India, Indonesia or Vietnam on mid-range phones, INP is often the weakest metric.
| Metric | Google "good" threshold | Observed value (example) | Likely cause |
|---|---|---|---|
| LCP (main content render) | < 2.5 s | 5.1 s | 2.4 MB JPEG hero, no preload |
| INP (interaction responsiveness) | < 200 ms | 410 ms | Blocking chat, tracking and carousel scripts |
| CLS (visual stability) | < 0.1 | 0.27 | Late cookie banner and web fonts |
| TTFB (server response) | < 0.8 s | 1.6 s | Shared hosting without page cache |
| Average page weight | < 1.5 MB | 6.8 MB | Uncompressed videos and images |
| Third-party scripts | < 10 | 23 | Piled-up ad pixels and widgets |
A serious audit goes beyond a PageSpeed score: it combines CrUX field data, a page-by-page network waterfall (home, programmes, brochure page) and a costed, prioritised plan.
2026 fix costs and expected gains
Typical ranges in 2026 for a school website of 80 to 200 pages, in EUR with USD and SGD indications.
| Workstream | Cost (EUR) | Typical gain |
|---|---|---|
| Core Web Vitals audit + action plan | 1,500 to 3,000 | Prioritised roadmap |
| AVIF/WebP conversion + image sizing | 900 to 1,800 | -60 to -80 % image weight |
| Preloading the LCP image and fonts | 400 to 900 | -0.8 to -1.5 s LCP |
| Cleaning up and deferring third-party scripts | 1,200 to 2,500 | INP halved, under 200 ms |
| Server cache + CDN | 800 to 1,800 | TTFB under 0.5 s |
| CLS fixes (cookie banner, reserved space) | 500 to 1,200 | CLS under 0.05 |
| Monthly Core Web Vitals monitoring | 150 to 300/month | Alert before regression |
| Total fixes | 4,000 to 9,000 | Target mobile LCP: 2.0 to 2.4 s |
In Singapore dollars, the full fix package lands around 5,800 to 13,000 SGD. If the site runs on a WordPress theme loaded with 30 plugins, fixes can hit a ceiling: above 9,000 EUR, a targeted technical rebuild becomes more cost-effective than stacking patches.
Mini case study
Rachel Tan, marketing director of a private business school in Singapore, gets 62,000 visits a year on programme pages with a 1.9 % brochure request rate, about 1,180 requests. After the audit (2,400 EUR) and fixes (6,800 EUR), mobile LCP drops from 5.1 s to 2.2 s and INP from 410 ms to 170 ms.
Applying a cautious assumption of +12 % conversion per second saved, capped at +30 %, the rate rises to about 2.5 %, or 1,550 requests: 370 more. With a 6 % request-to-enrolment rate and average tuition of 8,500 EUR per year, that is roughly 22 extra enrolments, about 187,000 EUR in first-year revenue for 9,200 EUR invested. Even divided by five, the ratio stays strongly positive.
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
FAQ
Is the PageSpeed score enough to judge performance?
No, PageSpeed gives a lab measurement on one simulated load. Google relies on real CrUX data at the 75th percentile of visitors over 28 days, which explains gaps of 1 to 2 seconds between the two.
How long before Google reflects the improvement?
CrUX data updates on a rolling 28-day window. Allow 4 to 6 weeks after release for URLs to move to "good" in Search Console.
Why AVIF instead of JPEG?
At comparable visual quality, an AVIF image weighs 50 to 70 % less than a JPEG. A 2.4 MB hero often drops below 300 KB, removing more than a second of LCP on 4G.
Do we have to remove marketing tools to fix INP?
Rarely: the work is mostly deferring them until after interaction or moving them server-side. Out of 23 third-party scripts, 6 to 10 are typically obsolete and can go.
What if the fixes are not enough?
If LCP stays above 3 s after 9,000 EUR of work, the root cause is usually the platform. A headless rebuild then costs 18,000 to 40,000 EUR depending on page volume.
Let's scope your project. Send us your website URL and traffic volumes: we will price the Core Web Vitals audit and fix plan, with an indicative budget and a 3 to 6 week timeline. 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.
