G13 — Chapter 7 - Technical SEO

Criterion G13: CDN — guide + checklist

PART 1 - Fundamentals Chapter 7 - Technical SEO Keyword : cdn

It is often seen as an error on mass-generated sites.

Criterion G13 — CDN is part of our SEO checklist (335 criteria). Here, you have a practical method to check and fix it — with a concrete example.

What exactly this criterion covers

It is often seen as an error on mass-generated sites.

G13 — CDN (Chapter 7 - Technical SEO): Content Delivery Network for static resources, reduces latency

Why it matters (SEO + UX)

Why it matters: it is a technical quality factor (crawl, rendering, indexing). When poorly applied, we often observe: ambiguity (wrong associated query), duplication between pages, or performance loss on indexing rate.

On volume-generated sites, this criterion also serves as a safeguard: a stable rule prevents 1,000 errors at once.

How to check (step by step)

Approach: browser-side control (rendering + code). Recommended tool: Lighthouse.

  1. Open the page in Chrome → DevTools → Performance/Network tab.
  2. Run PageSpeed Insights and note the main weak point.
  3. Check if the problem repeats on mass-generated pages.

Tip: first isolate 10 representative URLs (top pages + generated pages) before scaling the fix.

How to fix properly

Strategy: make a clean fix (no patch), then measure.

  • Fix the biggest cost source (images, JS, fonts, cache).
  • Retest, then apply to the template (not page by page).
  • Add a safeguard: weight budget (KB) and CI check if possible.

Then: recrawl 50–200 URLs, then monitor Search Console for 7–14 days (impressions/CTR/indexing).

Concrete example (illustrative)

Example (illustrative):

  • Context: category page for insurance in Casablanca
  • Before: Lighthouse: 25/100 (heavy JS, unoptimized images).
  • After: Lighthouse: 84/100 (lazy-load, compression, cache).
  • Note: Goal: stabilize INP.

Checklist to tick

  • [ ] Measure before/after
  • [ ] Respects: reduces latency
  • [ ] Improvement on template
  • [ ] No CWV regression
  • [ ] Cache and compression OK
FAQ

Frequently asked questions — G13

What is the most common error on “CDN”?

Trying to “optimize” by adding too many keywords, which degrades readability and creates repetitions.

Which tool is the fastest for large-scale checking?

For this type of criterion, a crawl (e.g. Screaming Frog) plus targeted verification in Lighthouse is generally the fastest combo.

How to prevent this from happening on 10K generated pages?

Freeze an auto-generation rule (title/structure/schema/URLs) plus add automatic control (crawl or test) before production import.

Ready to go from theory to action?

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