Performance Max asks advertisers to hand over targeting, placement and creative assembly, and to trust the outcome. For some accounts that trade works well. For others it quietly spends the budget on brand searches and cheap placements while reporting healthy-looking numbers.
The difference is almost entirely in the inputs, because the inputs are the only part you still control. Here is what those levers are and how to use them.
Your conversion data is the steering wheel
Everything the campaign does follows from what you have told it to value. If your conversion setup counts newsletter signups and phone-link clicks alongside genuine enquiries, the campaign will chase the cheapest of those and you will get a lot of them.
Before launching, reduce your primary conversion to the single action that represents real business value, and if you can, feed back actual sale values rather than a flat number. A campaign optimising towards revenue behaves completely differently to one optimising towards form submissions.
Asset quality is your creative control
You do not choose placements, but you do choose everything that gets assembled into them. That means headlines, descriptions, images at multiple aspect ratios, logos and video. Supplying thin assets – three headlines and two images – leaves the system to make the best of very little.
Supply variety deliberately: different angles, different lengths, different value propositions, and images that work when cropped square and wide. If you do not supply video, one will be generated from your other assets, and it will be worse than one you make.
The discipline here is closer to brand work than to ad writing, and the thinking in this guide to branded content transfers usefully – consistency across many assemblies matters more than any single asset.
Audience signals are hints, not targeting
Audience signals tell the campaign where to start looking. They are not constraints and it will move beyond them. Still, a good starting signal shortens the expensive learning period considerably.
Use your own data first: customer lists, past converters, high-intent site visitors. Generic interest categories are weak signals and often make things worse by pointing the campaign at a broad, cheap audience.
Exclusions are your main defence
The controls that matter most are the negative ones. Brand exclusions stop the campaign taking credit for searches that would have found you anyway. Negative keyword lists at account level filter obvious waste. Placement exclusions keep you off content you do not want to appear beside.
Set these before launch, not after the first month's report. Recovering budget already spent on the wrong traffic is not possible.
Search themes and asset groups give you structure
Splitting into asset groups by product line, service or margin gives you separate reporting and separate creative, which is the closest thing to control over where budget goes. One catch-all asset group is easy to set up and impossible to diagnose.
Search themes let you indicate the queries you actually want. They are directional rather than absolute, but they are considerably better than silence.
Accept the reporting limits and work around them
Placement and query reporting remains thinner than in traditional search campaigns. You will not get the full picture, so build the checks you can: watch total spend against enquiries you can verify, compare periods before and after any change, and keep a separate brand campaign so you can see brand and non-brand performance apart.
Treat any month where conversions rose while verified enquiries did not as a warning rather than a win.
Decide whether it suits your account at all
Performance Max rewards accounts with clean conversion data, a decent volume of conversions to learn from, and a wide range of products or services. It works less well for low-volume, high-value businesses where a handful of monthly enquiries gives the system almost nothing to learn from.
If your account is in that second group, tightly managed search campaigns will usually beat it, and that judgement is worth getting from Google Ads specialists who have run both rather than from the platform's own recommendation, which will always be to consolidate.
