By the time return on ad spend visibly drops, creative fatigue has usually been building for one to two weeks. Catching the early signals lets you refresh creative before performance — and budget — takes the hit.
Watch frequency, not just ROAS
Rising frequency against a stable or shrinking audience is often the earliest reliable signal. Once the same person sees an ad multiple times without acting, each additional impression contributes less.
CPM creep is a warning sign
As engagement on an ad declines, the platform's delivery algorithm treats it as lower quality and costs rise to maintain the same reach. A slow, steady CPM increase on an otherwise unchanged audience often points to fatigue rather than market conditions.
Build a testing cadence before you need one
Waiting until performance drops to brief new creative means a gap in coverage. Building a standing weekly or bi-weekly test slate keeps fresh concepts ready to rotate in before an existing ad's performance curve turns down.
Signals worth tracking weekly
- Frequency trending upward against a stable audience size
- CPM increasing without a change in competitive landscape
- Click-through rate declining over consecutive weeks
- Comment sentiment shifting negative on recurring creative
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