Key takeaways
- Performance Max bids on the conversion signal it receives: if the signal is poor, it chases the wrong goal.
- It suits ecommerce businesses with a well-maintained product feed and businesses with stable conversion volume.
- In B2B with few leads, it is better to consolidate Search and connect the CRM before handing over control.
- Brand exclusions, asset group structure and a prior experiment determine much of the outcome.
What is Performance Max?
Performance Max is a Google Ads campaign type that serves ads across Google's entire inventory from a single campaign. It covers Search, Shopping, YouTube, Display, Discover, Gmail and Maps. The advertiser provides goals, budget, creative assets and audience signals, and the system decides where, when and to whom each ad is shown.
Since 2022 it has replaced Smart Shopping and Local campaigns. Google has gradually added controls it initially lacked: brand exclusions, campaign-level negative keywords, a search terms report and performance data by channel.
Bidding follows the logic of automated strategies. The campaign maximises conversions or conversion value within the available budget, with an optional CPA or ROAS target. Everything therefore depends on what it is told counts as a conversion and how much each one is worth.
When should you use Performance Max?
It makes sense when the account already has reliable measurement and enough volume for the algorithm to learn. In our experience, the best results come from online shops with a well-maintained feed, businesses with stable monthly conversions and local businesses looking for visits or calls.
- Online shops with a complete Merchant Center feed, optimised titles and known margins.
- Businesses with sufficient and stable conversion volume every month.
- Accounts that measure real conversion values, not just the number of conversions.
- Brands with video, image and text assets for every format.
- Local businesses whose goal is store visits or calls.
When is it better to avoid Performance Max?
It is better to avoid it, or limit its weight, when the conversion signal does not reflect the value to the business. This happens in B2B companies with few leads, in accounts without CRM data and with budgets too small to build up data. It also applies when the brand needs to control every search term or every message.
| Situation | What happens | What to do first |
|---|---|---|
| B2B with few leads a month | The algorithm goes after the cheapest form fills, which tend to be the least qualified | Consolidate Search and import offline conversions |
| Measurement without CRM data | The campaign cannot tell a useful lead from an irrelevant one | Connect the CRM and send funnel stages |
| Need for strict control | Search terms, placements and messages are left to the system | Keep standard Search and Shopping for those segments |
| Limited budget | Little data to learn from and unstable results | Concentrate spend on Search with precise match types |
| Brand traffic not excluded | Part of the result comes from searches that were going to convert anyway | Apply brand exclusions from the outset |
Comparing it with other campaign types helps decide how to split budget within a channel-based acquisition strategy.
| Performance Max | Search | Standard Shopping | |
|---|---|---|---|
| Inventory | All of Google | Search results | Shopping and search |
| Control over searches | Limited | Full | Partial |
| Data requirement | High | Medium | Medium |
| Creative assets | Text, image and video | Text | Product feed |
| Typical fit | Ecommerce and local businesses with volume | B2B and specific demand | Catalogues that need product-level control |
Five questions before switching it on
Before moving budget, we go through five questions with each client. They help establish whether the account's problem lies in the campaign or in the measurement.
- Does the primary conversion represent revenue or just activity? If it is an unqualified form fill, the signal needs improving first.
- Is there enough volume? As a rough threshold, we work with around 30 conversions a month per campaign before setting a CPA or ROAS target.
- Are there creative assets for every format? Without your own video, Google generates automatic assets of uneven quality.
- Is the Merchant Center feed complete and error-free? In ecommerce it carries more weight than any creative.
- Can incrementality be measured? Without an experiment, it is hard to know how much of the result would have happened anyway.
If the answer is no to two or more questions, we recommend resolving those points before launching the campaign. Measurement usually comes first, and in B2B accounts that means setting up offline conversions in Google Ads.
How do you structure a Performance Max campaign?
The structure starts from how the business makes money. Asset groups are split by category or margin, and campaigns by distinct profitability targets. Each group carries creative assets, signals and products that are consistent with one another. On that basis, brand exclusions and conversion values that reflect margin are added.
- Split asset groups by category or margin, each with its own messages and products.
- Apply brand exclusions to measure acquisition without crediting the campaign with customers who were already searching for the company.
- Add audience signals using customer lists, website visitors and custom segments based on search behaviour.
- Import conversion values and set value rules by location, device or customer type where the margin justifies it.
- Create separate campaigns for products with very different profitability targets.
- Exclude the blog, job listings and legal pages from Final URL expansion.
Audience signals and consent
Signals guide initial learning but do not restrict targeting, and the campaign may show ads beyond them. In Europe, customer lists and remarketing require valid consent. Since March 2024, Google has also required Consent Mode v2 to use that data with users in the European Economic Area. If the shop also advertises on Meta, the Meta Conversions API solves the same signal problem there.
Running alongside Search and Shopping
When a search query is identical to an exact match keyword in a Search campaign, Google gives that campaign priority. This rule makes it possible to reserve the highest-value terms for Search. PMax then covers the demand the account does not yet reach.
Before shifting budget, it is worth measuring the impact with Google Ads experiments, which compare the account with and without the new campaign over a controlled period. We avoid running them during sales or seasonal campaigns, as these distort the comparison.
Does Performance Max work for B2B companies?
It can, but only when the campaign knows which contacts turn into opportunities and sales. With the form as the only conversion, the algorithm finds the cheapest leads. In B2B these tend to be students, suppliers or companies outside the customer profile, who fill the CRM without generating revenue.
The signal is built with offline conversion imports or enhanced conversions for leads. The CRM sends funnel stages back to Google Ads, for example qualified lead, opportunity and customer, each with its own value. Setting up that loop between form, CRM and ad platform is a GTM engineering task.
An implementation example
A typical case is a software company generating demo requests. In the first month, the CRM is connected and three events with different values are sent: form submission, sales-qualified demo and opened opportunity. The Search campaign then bids on the qualified demo as its primary conversion.
Once qualified demos reach the volume threshold, PMax is launched as an experiment, with brand exclusions in place and existing customers excluded. Until that volume is reached, spend stays on Search, where control over search terms makes up for the lack of data. The target account lists we build in audiences and ABM then serve as signals.
Performance Max pursues the goal it is given very effectively, including the wrong one. Deciding that goal is still the team's job.
Juan Berges, CEO of The Baller Company
Common mistakes when switching it on
Launching the campaign with every conversion in the account set as primary is the most frequent mistake. Contact page visits, phone clicks and purchases all carry the same weight, and bidding heads for whatever is easiest.
The second is judging results in the first two weeks. Frequent changes to budget, target or assets extend the learning period. The sensible approach is to wait for several weeks of data before touching the bid target.
The third is leaving Final URL expansion unchecked. The campaign ends up sending traffic to blog articles or careers pages, which add clicks but no sales. For online shops, the fourth is a feed with weak titles, lacking brand, model or attributes, which keeps products out of specific searches.
Which metrics to review
The campaign report shows attributed conversions, but not how many were new or whether they left a margin. That is why we review these metrics against business data.
| Metric | What it shows | Where to find it |
|---|---|---|
| Cost per conversion and ROAS with real values | Campaign profitability | Google Ads with imported values |
| New versus returning customers | Genuine acquisition versus repeat purchases | New customer acquisition goal |
| Performance by channel and asset group | Which inventory and messages drive results | Channel performance report |
| Search terms and share of brand traffic | Results coming from existing demand | Search terms report |
| Qualification rate | Quality of the leads generated | Connected CRM |
In ecommerce, it is also worth checking which products absorb the spend. It is common for a handful of items to take almost the entire budget while the rest of the catalogue barely receives impressions. Splitting them into their own asset groups or campaigns restores control over allocation, and solid web analytics shows the margin each one delivers.
Where to start
Before creating the campaign, review which actions count as primary conversions and what each one is worth. If the account is ecommerce and the feed is in order, we recommend launching Performance Max as an experiment against the current structure.
Brand exclusions should be active from day one. If the account is B2B, the first step is to connect the CRM and give the Search campaign a few weeks with the new signal. Once measurement is sorted, Google Ads campaign management stops paying for the learning phase twice.
Frequently asked questions
How much budget does Performance Max need?
There is no official minimum. What matters is that the budget allows conversions to build up, and as a guide we work with around 30 a month per campaign. With a high cost per conversion and low spend, the campaign never leaves the learning phase, and it makes more sense to concentrate spend on Search.
Does Performance Max cannibalise branded searches?
It can if brand exclusions are not set up. In that case, part of the attributed conversions comes from users who were already searching for the company and would have bought anyway. Exclusions and the search terms report make it possible to measure the genuine acquisition the campaign delivers.
Can you launch a campaign with just the product feed?
Yes. A campaign without text, image or video assets serves mainly on Shopping and behaves much like Shopping with automated bidding. It is a useful way to get started with large catalogues and few creative assets available.
How long should you wait before evaluating results?
The learning period usually lasts one to two weeks, but evaluation needs longer. We recommend comparing four to six weeks of data, covering complete conversion cycles and with no changes to budget or target during that period.
