Performance Max

Performance Max is powerful but opaque. Diagnose → Performance Max opens it up so you can see what is driving results and where it overlaps with the rest of the account.

What it analyses

• Asset-group coverage — gaps and weak asset groups limiting reach and relevance.
• Cannibalisation — where PMax is absorbing conversions that search would have won anyway.
• Search insights — the queries PMax is actually buying.

How to use it

Check asset-group coverage first — thin asset groups are a common, fixable cap on PMax performance. Then review cannibalisation to understand PMax''s true incremental contribution before you scale it. You can open a specific PMax campaign for detail.

Prove incrementality

Because PMax overlaps with search and shopping, its incremental value is a perfect question for the Causal Lab or a geo experiment.