Google Performance Max campaigns promise automated excellence — but are they right for every business? Our PPC team breaks down the pros, cons and best practices.
Performance Max — or PMax, as it has become universally known in the Google Ads world — has been Google's flagship campaign type since it began replacing Smart Shopping and Local campaigns in 2022. Three years on, it remains the subject of heated debate among paid media professionals. Some swear by it. Others have watched their accounts deteriorate after switching to it. The truth, as ever, is more nuanced.
Performance Max is a goal-based campaign type that uses Google's machine learning to serve ads across all of Google's channels — Search, Display, YouTube, Gmail, Discover, and Maps — from a single campaign. You provide the creative assets (headlines, descriptions, images, videos), define your conversion goals, and set a budget. Google's algorithms then decide where, when, and to whom to show your ads.
The appeal is obvious: maximum reach from a single campaign, with Google's AI doing the heavy lifting on bidding and placement decisions. The concern is equally obvious: you cede a significant amount of control over where your budget is spent.
No other campaign type gives you simultaneous access to Search, YouTube, Display, Gmail, Discover, and Maps. For businesses that have historically only used Search campaigns, PMax can genuinely open up new customer acquisition channels that would be complex and time-consuming to manage individually.
For ecommerce advertisers with a well-structured Google Merchant Center feed and meaningful conversion data, Performance Max has demonstrated strong results. The machine learning is at its most effective when it has sufficient data to learn from — typically at least 50 conversions per month in your account.
For smaller businesses without dedicated PPC resource, PMax reduces the complexity of running multiple campaign types. A single campaign with well-structured asset groups can replace what would previously have required separate Search, Display, and Shopping campaigns.
This is the most significant criticism of PMax, and it is valid. The Search Terms report does not show you all the queries your ads are appearing for. You cannot see a granular breakdown of spend by channel. You cannot add negative keywords at the campaign level in the same way you can in Search campaigns (though account-level negatives and campaign-level exclusions via Google's support team are possible).
Performance Max will almost always find and serve on branded search terms — i.e. people searching directly for your business name. This can inflate your conversion numbers significantly, because branded searches convert at a much higher rate than non-branded searches. If you are not carefully segmenting your reporting, you may be attributing brand-driven conversions to PMax and overestimating its true incremental value.
Google's machine learning requires data. Specifically, it requires conversion data. If your account is generating fewer than 30-50 conversions per month, PMax's algorithms will struggle to optimise effectively and you may see erratic performance, particularly in the first 6-8 weeks of a campaign's learning period.
Performance Max is a powerful tool in the right circumstances, but it is not a universal solution. Our general guidance for businesses in Cheshire and beyond:
If you would like an independent review of your Google Ads account structure, CMC offers free PPC audits for businesses across Cheshire. Get in touch to find out how we can improve the performance of your paid media investment.