Performance Max: when it works and when it burns budget
Performance Max works when measurement is clean, there are enough real conversions and good assets, and in an online store also a well-organized product feed. It burns budget when it learns from conversions that aren’t worth money, pays for brand-name searches you would have got anyway, or spends on channels that don’t bring sales. Since 2025 Google shows performance by channel and full search terms, so you can check exactly where the money goes.
What is Performance Max?
Performance Max is a Google Ads campaign type that runs ads from one campaign across all of Google’s channels: Search, YouTube, Discover, Gmail, the Display Network, search partners and Maps. You provide a conversion goal, a budget, text, images and videos, and in an online store also a product feed. The system decides on its own where, to whom and at what bid to show them.
The advantage is wide reach with little manual work. The downside is that when the system learns from the wrong data, it spends money fast, and in places you don’t see at first glance.
When does Performance Max work?
- Measurement is clean. Google recommends choosing the same conversion goals for the campaign as in your search campaigns, and measuring conversions with value. The conversion should be an action worth money: a purchase or a submitted lead, not a page view.
- There are enough conversions. The system learns from conversions. A campaign that gets only a handful of conversions a month learns slowly and behaves erratically.
- In a store: the feed is in order. Clear product names, up-to-date prices and stock, and good images. The feed is a big part of the ad.
- There are enough assets. Google recommends building each asset group around one theme, and adding as many texts, images and videos as possible, including a video of at least 10 seconds.
- You have a clear target. A maximum cost per lead or a break-even ROAS. Without a target there’s no way to know if the campaign is profitable. Here’s how to calculate target cost per lead, and here’s how to calculate break-even ROAS.
When does it burn budget?
| What you see | What’s actually happening | What to do |
|---|---|---|
| Lots of cheap conversions, few sales | The conversion being measured is a click, a view or an irrelevant lead, and the system brings more of the same | Measure only actions worth money, and send Google data on lead quality |
| High ROAS that doesn’t show up in actual sales | A large share of revenue comes from brand-name searches, from customers who would have bought anyway | Check the search terms report, and use brand exclusions or negative keywords |
| High spend with no conversions in a particular channel | The budget flows to the Display Network or YouTube with no result | Check the channel performance report, and improve assets or limit the campaign |
| Performance jumps every week | Frequent changes to budget, target or assets don’t let the system learn | Change less, in small steps, and judge over a longer period |
What changed, and why it’s good for you
For years Performance Max was a black box. In 2025 Google opened it up significantly:
- Channel performance report: how much you spent and how many conversions came from Search, YouTube, Display and the other channels.
- Full search terms report: you can see which searches you paid for.
- Data per asset: impressions, clicks, cost and conversions for every text, image and video.
- Negative keywords: you can add them to the campaign or to the whole account. They apply to Search and Shopping only.
- New customer goal: you can ask the system to focus on new customers. To use a customer list, it needs at least 100 active members.
How do you check whether Performance Max is really profitable?
- Compare to your target, not to Google’s average: cost per lead against the maximum cost, or ROAS against break-even ROAS.
- Don’t judge the last few days when conversions arrive late. Google gives an example: if a conversion usually takes 7 days, don’t check the last week.
- Separate brand from everything else. Check how much revenue came from searches for your business name.
- Compare to actual sales or the CRM. The platform tends to take credit for sales. Why it happens and how to check.
Example: a campaign spent ₪10,000 in a month and reports ₪50,000 in revenue, a ROAS of 5. But ₪30,000 of that came from brand-name searches, which cost ₪2,000. Without the brand, you’re left with ₪20,000 revenue on ₪8,000 spend, a ROAS of 2.5. If your break-even ROAS is 3, that part of the campaign is losing money. (Illustrative numbers.)
So, turn it on or not?
If measurement is clean, and you have a clear target and enough conversions, Performance Max can bring sales that are hard to get from search campaigns alone. If measurement is weak, fix it first, and only then raise the budget. We check the channel report and search terms regularly, so the money goes to sales and not to impressions. Google campaign management with us, and you can check your numbers in the calculator.
Want to know where you stand? We’ll check the numbers against your account, free of charge.
Get a fit checkFrequently asked questions
How long should you wait before judging a Performance Max campaign?
Google recommends not checking the last few days when conversions arrive late. In its example, if a conversion takes 7 days, don’t judge the last week. We give the campaign a few weeks without big changes before deciding.
Is Performance Max suitable for lead-gen businesses?
Yes, when you measure real leads and send Google data on lead quality. Google notes that “new customers only” mode also suits non-purchase goals, such as leads.
Can you add negative keywords to Performance Max?
Yes. You can add them to a specific campaign or to the whole account. They apply to Search and Shopping only, not to YouTube or Display. For searches on brand names there are also brand exclusions.
Sources
- Multiply conversions with Performance Max – Google Ads Help
- Channel performance and more reporting coming to Performance Max – Google
- Negative keywords in Performance Max campaigns – Google Ads Help
- About brand settings for Search and Performance Max – Google Ads Help
- About customer lifecycle goals – Google Ads Help
- Step 1 of 5: Define your customer lists – Google Ads Help
Founder of SMOLANSKI Media. 14 years in advertising management, 10 of them at Israel’s leading media and advertising agencies.
Related services: Google campaign management · Campaigns for online stores · Campaigns for lead-gen businesses
More articles
How much should you spend on ads each month? Working out a minimum budget for Meta and Google
How to work out a monthly ad budget for Meta and Google: how many conversions the platforms need to learn, a simple formula for a minimum budget, and what to do when your budget is smaller.
November 13, 2026 · 3 min readLeads & salesWhy are your Facebook leads low quality? 6 reasons and what to do
Why Facebook and Instagram leads don’t answer or aren’t relevant: a form that’s too easy, optimizing for volume, no feedback to Meta and slow follow-up. And how to get leads that close.
November 13, 2026 · 4 min readMeasurement & profitabilityA paid advertising glossary: ROAS, CPA, CPL, pixel and more, in plain language
A glossary of paid advertising on Google and Meta: what ROAS, CPA, CPL, CPM, CTR, pixel, Conversions API, lookalike, remarketing and learning phase mean, with an example for each.
November 13, 2026 · 4 min read