Google Ads: Performance Max campaigns

Performance Max (PMax) is one of the most powerful and potentially misunderstood campaign types available from Google in 2025.

Launched as one part of Google’s broader transition towards automation, it allows savvy marketers the chance to reach an unprecedented selection of Google’s platforms across a single campaign for the very first time.

But for all its strengths, it’s not a magic button. To get the very best from a Performance Max campaign, you need to understand how it’s evolved, where best to use it in your campaigns, and when it’s better to hold back.

This guide will arm you with insight and answers, so you’re ready to take actionable steps in how you work with PMax in the future. Ready to level up? Read on to find out more.

• What is Performance Max?
• What's changed in 2025: the evolution of PMax
• PMax's strengths and limitations
• How to structure a PMax campaign
• Performance Max best practices
• Measuring success: what to track in a PMax campaign?
• When to not use PMax

What is Performance Max?

PMax is an ad type that allows you to run ads across all Google channels through one campaign, simplifying management and expanding your reach. It uses machine learning to optimise ad delivery based on performance data, so you put in some pointers to guide the ad creation, while PMax does a lot of heavy lifting.

PMax is designed to help you find more converting customers by automating your targeting and delivery. THink of it as something that can think a little outside the box, presenting your ads to audiences that are data-backed as being potentially interested in your product or service. It was Introduced to complement existing keyword-based Search campaigns, not necessarily as an ad type to be used in isolation. 

Overall, PMax is especially beneficial if you’re working towards specific conversion goals and want to uncover new audiences to interact and engage with your brand online.

What’s changed in 2025: the evolution of PMax

Since its launch in November 2021, PMax campaigns have had a series of updates over the years. Fast-forward to today, and some of the most useful new features are available.

Enhanced campaign controls

• Campaign-Level Negative Keywords: You can now exclude specific search terms directly within PMax campaigns as a whole, improving brand safety and relevance.

• Brand Exclusions: Don’t want to show up for your competitor’s brand names? Create a list of brand names and exclude them across your campaign.

• Demographic and Device Targeting: Age-based demographic targeting is now available, along with device targeting, offering more refined audience control (and hopefully some saved budget!)

Improved reporting and insights

• Search Term Insights: Want to know where your clicks are coming from? Search Term Insights let you know if your search queries are coming from your own search themes, or PMax’s keywordless targeting. With the split between AI and human-led optimisation, this information is vital to any modern marketer.

• Asset Group Performance Data: This is an insightful hub of data that tells you how much each asset of your ad (head-lines, images, video etc) are contributing to the ad’s success. This helps you uncover what’s really resonating with your customers.

PMax’s strengths and limitations

Strengths

• Broad reach: This ad type gives you access to all Google ad inventory through a single campaign. Simple setup, huge potential for reach.

• Automation: The main feature of PMax is its extensive automation abilities, simplifying campaign management by automating bidding, targeting, and creative optimisation.

• Data-Driven Bidding: Pmax uses Google's AI to optimise bids for conversions or conversion value, meaning you get a data-backed bidding strategy, every time.

• Levels-up e-commerce: This ad type seamlessly integrates with Shopping ads, so you get all the benefits of PMax within a complex Shopping campaign.

Limitations

• Limited Search Term Visibility: Compared to keyword targeting, you do get less transparency into specific queries triggering your ads.

• Creative Combinations: Your automated asset combinations may not always align with brand messaging. This issue is something you can sort out through carefully creating any example assets to inform your PMax campaigns, but will require manual optimisation.

• Reduced Placement Control: Due to the machine-learning-backed placement of MPax, you have less ability to specify where your ads appear, so keep a close eye on where your ads show up.

• Campaign Overlap: There is the potential for PMax to take traffic from other campaigns if not structured carefully. The remedy to this is simple: don’t plan your PMax campaign in isolation; create it as one part of multiple campaigns across your account. 

How to structure a PMax campaign

Segment asset groups by product categories, audience segments, or promotional themes to maintain relevance. Each asset group should contain tailored creatives and audience signals.

Ensure all product titles and descriptions in your product feed are clear and keyword-rich. Then use custom labels to segment your products for better targeting and reporting.

Provide high-quality images, videos, headlines, and descriptions to guide Google's automation effectively. Regularly review the asset performance and update underperforming creatives.

This simple process boils down to segmentation, creation (of assets) and analysis. Then you keep what works, and optimise what’s falling behind.

Performance Max best practices

Here are a few tips and tricks to get the most out of your PMax campaign: 

• Use professional images and videos, compelling headlines, and clear calls-to-action. If your assets are high quality, your ads will be high quality.

• Regularly assess your asset group performance, to see which combinations perform best and adjust accordingly.

• Incorporate customer match lists with your first-party data for the ultimate in targeting precision.

• Set clear conversion actions and values to guide your optimisation.

• Provide Google with data on your ideal customers to improve targeting efficiency via audience signals.

Measuring Success: What to Track in a PMax Campaign

So you’ve set up your first PMax campaign and have a wealth of data at your fingertips. What metrics are the most useful to you? Here’s a helpful guide on what to look for:

• Return on Ad Spend (ROAS): This is where you can see the revenue generated for every pound spent. What’s working in your budget, and what needs to improve?

• Conversion Value/Cost: This looks at the difference between what you spend, and what revenue is brought in when a user converts.

• Asset Group Performance: Identify which asset combinations drive the best results. Simple but transformative metrics.

• Audience Signal Strength: Monitor how well your audience signals are performing.

• Search Term Categories: Review what types of searches are triggering your ads.

• Conversion Quality: Focus on the value and relevance of any conversions, not just ;their volume.

When not to use PMax

PMax is the right answer to many modern marketing challenges. But if used at the wrong time, with the wrong account, or for the wrong reasons, it will end up wasting your budget. Here’s all you need to know on when not to use a PMax campaign.

Brand or competitor campaigns
If you're bidding on your own brand terms or targeting specific competitors, PMax offers too little control over keywords and placements, so it’s best to use a keyword-based targeting campaign instead.

Campaigns that rely on precision (such as exact match or phrase match strategies) are better suited to traditional Search campaigns, where you can dictate exactly how and where your ads appear.

Regulated industries
Industries like finance, healthcare, alcohol, and legal services often require granular control over where ads are shown and what copy is used. Because PMax automates your placements and creative combinations, there's a higher risk of non-compliance or reputational damage in these environments.

Limited creative assets
PMax relies heavily on a wide range of high-quality creative assets to test and optimise across formats, including video, images, headlines, and descriptions. If you don’t have strong creative assets ready to go, the system may struggle to perform well, or produce combinations that don’t reflect your brand properly.

So, hold off on creating a PMax campaign until you have the assets to properly reflect your brand's professionalism and quality.

Unclear or weak conversion tracking
If your conversion tracking is inaccurate, unverified, or too broad (e.g. counting page views as conversions), Google will optimise towards the wrong outcomes.

For lead generation in particular, poor tracking can mean a high volume of low-quality leads that don’t convert into sales. Do your budget a favour and get precise about your conversion tracking, to save these issues from arising.

Closing notes

At the end of the day, Performance Max is only as good as the data it receives. But pair it with a well designed product feed, top quality creative assets and a strong first-party data, and you’ll be geared for success.

But it’s not as simple as setting and forgetting. Checking in and analysing the results regularly will provide you with all the insight you need to optimise and refine your PMax campaigns over time. Allowing them to develop and grow as your business scales.

Guide it well, and you’ll be driving growth to your campaign and overall marketing strategy like never before.