How long does it take for campaign changes to work?


I’ve had a campaign running for years and decided to rationalise it. All I did was create a few new ad groups and moved products between them. All budgets, bids, strategy the same. But the who campaign has tanked over the last week. My impressions and ROAS have halved. Is this normal? Does it take a while for changes to take effect? Or have I messed it up somehow?

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