"As a reminder, Google officially announced this core update on December 11th at around 12:25 pm ET. Google said this update will take up to three weeks to roll out. Google also said, this update "is a regular update designed to better surface relevant, satisfying content for searchers from all types of sites." Generally, but not always, we start to see ranking movement from these updates a day or two after it is announced and this update seems to show that."
"Generally, but not always, we start to see ranking movement from these updates a day or two after it is announced and this update seems to show that. Then generally, we see another big shift with these updates a week or two into the update. Then we may see smaller or sometimes even bigger shuffled throughout and even after the core update was announced done - maybe smaller core updates and adjustments."
Google announced the December 2025 core update on December 11th with a rollout window of up to three weeks. The update aims to better surface relevant, satisfying content for searchers across all types of sites. Initial ranking movement appeared within a day or two after the announcement, with notable volatility on December 13 and intensified volatility on December 20. Core update behavior often includes an early shift, a larger reshuffle one to two weeks in, and subsequent smaller or occasional larger adjustments. Multiple tracking tools reported big spikes, and early SEO chatter indicated unfavorable impact in some topic areas.
Read at Search Engine Roundtable
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