Why are my scores different from PageSpeed Insights?

SlapMyWeb scores vs PageSpeed Insights

If your overall SlapMyWeb score is 73 but PageSpeed says 92 — that's expected. We measure more.

What PSI measures

PageSpeed Insights v5 returns:

• 4 lab category scores (Performance · Accessibility · Best Practices · SEO)
• 7 Core Web Vitals lab metrics
• Field data from Chrome UX Report (if enough real-user traffic)

That's it. It's a tight, focused tool — and we use it inline as one of our 16+ inputs.

What SlapMyWeb adds

Our overall score blends 11 weighted pillars covering ~290 signals:

1. Crawl & Indexation
2. On-Page SEO
3. Content Intelligence
4. Link Architecture
5. Mobile & UX
6. Technical Performance ← PSI lives here, weighted 10%
7. Structured Data
8. International SEO
9. Authority & Backlinks (Enterprise)
10. Competitive & SERP (Enterprise)
11. AI Search Readiness (unique to SlapMyWeb)

So a site can ace PSI (great Core Web Vitals) but score lower with us because its on-page SEO is weak, schema is missing, hreflang is broken, or AI bots are blocked.

When to trust which

• Engineering-focused changes (performance): PSI is your source of truth — we report what it reports
• Holistic SEO health: SlapMyWeb's overall score is more accurate because it sees more
• Comparing periods: Our Compare mode shows score deltas across runs, which PSI doesn't do at all

Both are right at what they measure. They just measure different things.