Contents
- Performance Max runs a single campaign across all Google inventories: Search, Shopping, Display, YouTube, Gmail, Discover and Maps.
- In exchange for that reach, you lose most of the control and visibility: no impression share, no Quality Score, no full search terms report.
- It assumes a stable conversion history. Below about thirty regular monthly conversions, it learns in the noise.
- Without an account-level brand exclusion, it captures brand traffic and shows flattering results that mean nothing.
- The only performance lever you really keep is the quality of the creative assets supplied.
What Performance Max does
Instead of creating one campaign per network, you supply assets: headlines, descriptions, images, videos, and a product feed if you have one. Google composes the ads and decides where, when and to whom to serve them, optimizing toward the declared conversion goal.
Targeting goes through audience signals. You suggest who might be interested, the algorithm uses it as a starting point then moves away from it as it learns. These aren't filters, unlike a classic campaign's targeting: an audience signal excludes no one.
That's the difference in nature to grasp before anything else. On a Search campaign, you decide and Google executes. On Performance Max, you feed and Google decides. Google's official documentation on Performance Max details the exact scope.
The seven inventories covered
| Inventory | Intent level | What it brings |
|---|---|---|
| Search | High | Queries not covered by your Search campaigns |
| Shopping | High | Product listings from the Merchant Center feed |
| Display | Low | Volume and reach, often the largest share of the budget |
| YouTube | Low to medium | Awareness and video remarketing |
| Gmail | Low | Promotional format in the Promotions tab |
| Discover | Low | Recommendation feed on mobile |
| Maps | High | Local queries with visit intent |
It's the point most often discovered too late: on many accounts, most of the budget goes to the low-intent inventories, with nothing clearly indicating it in the standard reports.
What you gain, what you lose
- Broad reach without multiplying campaigns
- Automatic budget reallocation toward what converts
- Reduced management time, a real argument in agencies
- Access to Shopping without a dedicated campaign
- Neither impression share nor Quality Score
- Partial search terms report
- Split between inventories not steerable
- Hard to diagnose when it underperforms
- Control of the triggering queries
- Impression share and Quality Score visible
- Direct diagnosis via search terms
- Works from the first conversions
- Reach limited to the search network
- Requires regular steering
- Plateaus when the query volume is reached
When to turn it on
Five questions to ask beforehand, in this order. If the answer is no to either of the first two, consolidate a Search campaign first.
- Does the account have a stable conversion history?
Below about thirty regular monthly conversions, the algorithm has nothing to learn from. It will spend anyway, and it will learn in the noise.
- Are the conversions reliable?
Performance Max optimizes toward what you declare. A wrong measurement produces wrong delivery, worse than elsewhere, because no manual safeguard corrects the trajectory. Check the Quality Score and the consistency of your conversions before opening the tap.
- Is the brand excluded?
Without an account-level exclusion list, the campaign captures brand traffic, cheap and highly converting. The results will be flattering and misleading, and your Search campaigns will suffer.
- Are there enough creative assets?
A campaign fed with three headlines and one image will deliver poorly, for lack of material to combine. Count at least five headlines, five descriptions, a dozen images in the required formats, and a video if possible.
- Does the budget allow exiting learning?
Splitting a small budget between Performance Max and Search starves both of the volume needed. Better one well-funded campaign than two underfed ones.
Structuring the campaign before launch
The structure of Performance Max plays out on three objects: the asset groups, the audience signals and the exclusions. That's about all that still belongs to you.
The asset groups
One asset group per real theme, never for organizational convenience. Each group is evaluated separately and shows its own effectiveness level, which makes it the only creative diagnosis level available. Three to five groups are enough on most accounts.
The audience signals
Customer lists, site visitors, custom audiences built on queries. They speed up the learning of the first weeks and lose influence afterwards. Neglecting them lengthens the learning phase without preventing it.
The exclusions
Account-level brand exclusions, placement exclusions, sensitive-content exclusions. It's the most effective direct lever you have, and it's systematically underused.
How to steer it once launched
| What you watch | Where | How often |
|---|---|---|
| Cost per conversion against Search campaigns | Comparative report, brand excluded from both | Weekly |
| Asset group effectiveness | Asset groups tab | Every two weeks |
| Available search terms | Insights report | Monthly |
| Display placements | Placements report | Monthly |
| Creative assets rated low | Assets tab | Monthly |
The comparison with Search campaigns is only honest if the brand is excluded on both sides. Without that precaution, you're comparing a campaign that captures existing demand to one that goes looking for it, and Performance Max will always win.
The mistakes that cost the most
| Mistake | What it produces | The fix |
|---|---|---|
| Launching without brand exclusion | Flattering results, Search cannibalization | Account-level exclusion list |
| Counting unqualified conversions | The algorithm optimizes toward nothing | One conversion per real intent, value filled in |
| Creating ten asset groups | None accumulates enough data | Three to five groups, by real theme |
| Changing the campaign every day | Learning restarted constantly | A two-week window with no change |
| Judging under three weeks | Decision made on noise | Wait for stabilization before arbitrating |
Tracking Performance Max without spending your days on it
The steering described above means opening several reports, cross-referencing periods and redoing the same filters every week. On a portfolio of ten accounts, that's an unbillable half-day a week.
Adwise removes this step. The Google Ads account is connected to the Workspace, and the question is asked directly: what share of the budget went to Performance Max this month, how its cost per conversion compares to non-brand Search, which asset groups are dropping off. The answer comes in seconds, on your real data, and the client report is generated from the same base.
The available integrations and tools are detailed on the site.
Frequently asked questions
The Adwise team connects Google Ads, Meta Ads, LinkedIn Ads, GA4 and Search Console so agencies and freelancers can run their campaigns from a single place.