The Black Box of PMax
Google's Performance Max is a highly automated campaign type that spans Search, YouTube, Display, Discover, and Maps. However, without strict constraints, PMax can waste budget on poor-quality display placements or brand bidding. Controlling PMax requires feeding it high-value data signals.
Asset Group Isolation & Audience Signals
Do not mix products or messaging within a single asset group. Instead, isolate asset groups by product category and provide specific search themes and customer match lists. This gives Google's bidding algorithm a baseline of what a high-converting user looks like.
Negative Keyword Exclusions
Ensure brand keywords are excluded from your PMax campaigns to prevent it from stealing credit from organic search. Set up account-level negative keyword lists to target strictly non-brand queries and maximize net incremental revenue.