The mistake: blaming the network for a CLS penalty you triggered

The mistake: blaming the network for a CLS penalty you triggered

Steelman: you turned on every ad slot because more units feels like more money. Reasonable instinct.

The asterisk: anchor ads, vignettes, and aggressive in-content slots inflate RPM today and quietly tank Core Web Vitals over weeks. Then organic traffic slides, and you blame the network's "declining fill."

🚩 Hidden variable: layout shift and interstitial penalties land 4-8 weeks after you crank density. The cause and the symptom never share a dashboard.

The fix: change one ad-density setting at a time, then watch CrUX field data for 28 days before the next move. Correlate RPM and traffic, not just RPM.

Not saying density is bad — saying blaming fill rate for a problem you built is rigged.