Google Answers Question About Core Web Vitals “Poisoning”

August 17, 2025

Google Answers Question About Core Web Vitals “Poisoning”

Someone posted details of a novel negative SEO attack that they said appeared to be a Core Web Vitals performance poisoning attack. Google’s John Mueller and Chrome’s Barry Pollard assisted in figuring out what was going on. The person posted on Bluesky, tagging Google’s John Mueller and Rick Viscomi, the latter a DevRel Engineer at

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Google Answers Question About Core Web Vitals “Poisoning” | The Gradient