Ads add scripts, and scripts slow pages down. But a slow page loses visitors, which loses revenue. The goal is not fewer ads — it is smarter loading.
Reserve space for ad slots
Fixed-size containers prevent layout shift (CLS) when ads load late.
Defer non-critical scripts
Load analytics and ad libraries after the main content is interactive to protect LCP and INP.
Measure with real-user data
Lab tests are useful, but field data from real visitors tells you what search engines actually see.