Google Performance Max Campaigns: 6 Things to Know Before Using Them in B2B

For the past few years, Google Ads has been heavily promoting Performance Max (or PMax) campaigns, often presented as the future of online advertising. Unsurprisingly, Google is pushing them strongly, and many of the latest platform updates focus on this campaign type. Over time, PMax has also replaced and “absorbed” other formats, such as Smart Shopping and Local campaigns.

At first glance, the idea behind Performance Max seems perfect: a single campaign that, through automation and machine learning, distributes ads across all Google channels, increasing reach while reducing management time. It’s no wonder that many marketers are wondering whether they should start using them for their business too.

The reality, however, is a bit different. While Performance Max certainly has strengths, it also comes with significant limitations—especially for B2B companies focused on lead generation and working with tighter budgets.

In this article, we’ll explain what PMax campaigns are, their advantages, and when it really makes sense to use them in B2B.

1. Google Performance Max: What Are They and How Do They Work?

Performance Max campaigns allow you to show ads across all Google channels (Search, Display, YouTube, Discover, Gmail, Shopping, and Maps) in various formats (text ads, images, video) with just a single campaign setup.

Automation is at the core of PMax. Using machine learning, Google:

• decides how to allocate the budget across channels;
• selects ad combinations and audiences it believes are most effective for your goals.

This means advertisers lose some control over campaign management and can only provide initial input for the algorithm to work with:

• Daily budget: you can set how much you’re willing to spend, but you cannot control how it’s split across channels.
• Bidding strategy: you can choose the Smart Bidding strategy that best fits your goals.
• Objectives: conversion tracking is essential for PMax to work. Proper setup and assigning values to actions based on their business importance are key to helping Google prioritize correctly.
• Creative assets: quality text, images, and videos matter. The algorithm mixes and matches them to find the best-performing combinations.
• Product feed: e-commerce stores can connect product feeds to activate Shopping ads.
• Audience signals and search themes: you can provide customer lists, interest-based audience segments, or search themes, which Google uses as guidance to find potential customers.

2. The Potential Benefits of Performance Max

Given this setup, PMax campaigns can offer several appealing benefits:

Maximum reach

One campaign covers the entire Google ecosystem without the need to run separate campaigns for each channel.

Continuous optimization

Google’s AI works to maximize performance by identifying potential customers based on the provided signals, selecting the best ad, and bidding in real time for auctions most likely to achieve your goals.

Simplified management

Less time is needed for campaign management. Marketers can focus on creative assets and business goals, leaving optimization to Google.

One important factor: these campaigns perform best with large volumes of data and conversions. Machine learning needs enough input to “learn” and improve results.

This is why PMax is particularly effective for B2C e-commerce with large budgets, where transaction volumes provide the data Google needs to optimize performance.

3. The Drawbacks of Performance Max

While the benefits may sound compelling, it’s just as important to understand the limitations—many of which are especially critical in a B2B context:

Limited budget control

You can’t decide how much to spend on each channel. Google might prioritize channels less effective for B2B (like Display, YouTube, or Gmail), while underinvesting in Search, which typically brings fewer but higher-quality leads.

Imprecise targeting

Targeting is handled by the algorithm, using your audience signals and CRM data only as guidance. Advertisers must trust Google to find the right users, with less precision than in traditional campaigns.

Need for higher budgets

Spreading spend across multiple channels requires bigger investments to see results. The algorithm also needs around 50–100 conversions per month to optimize properly—numbers many B2B companies struggle to reach in niche markets with smaller budgets.

Internal competition with other campaigns

PMax may “cannibalize” traffic already captured by existing campaigns, intercepting queries or users that could have been better served by more targeted formats.

Limited reporting

Google provides fewer insights than with other campaign types, making it harder to analyze performance and identify which channels or assets are truly driving results.

Many advertisers rely on external tools or scripts to gain more visibility into PMax performance, but the level of detail still falls short compared to traditional campaigns.

4. B2B: When Does It Make Sense to Use Performance Max?

Despite the drawbacks, there are cases where B2B companies may benefit from testing a PMax campaign, such as:

• when looking to expand reach beyond known audience segments: relying on Google can help you reach new potential customers who would not emerge from traditional campaigns;
• in niche industries where search volumes are too low for Search campaigns alone: in these cases, PMax can boost your visibility (though Display or YouTube campaigns could achieve similar results);
• for B2B e-commerce (e.g., selling components), where Smart Shopping features and sufficient transaction data can support optimization;
• when you lack the time or resources for detailed campaign management: companies with small marketing teams might be encouraged to delegate most decisions to automation;
• when aiming to maintain visibility across multiple channels without needing strict control: in situations where you want to boost your visibility everywhere without creating dedicated campaigns, PMax can be a quick starting point;
• to target lookalike audiences: if you have strong CRM or customer data, a PMax can use it to reach similar users.

5. B2B: When Is It Better to Avoid Performance Max?

On the other hand, there are several cases in which Performance Max is not the ideal choice, in particular:

• when your goal is to capture qualified leads through specific searches: in these cases, Search campaigns remain more effective, because they allow you to target keywords directly linked to the customer’s real needs;
• when your budget is limited: spreading spend across multiple channels reduces impact, so in this case it is better to concentrate investment on more targeted campaigns;
• when lead quality matters more than quantity: the broad reach of PMax may generate many contacts, but not always relevant ones;
• when you need to maintain control of the budget for each individual channel: if your company wants to decide how much to allocate to Search, Display, or YouTube, Performance Max campaigns are not suitable, because they leave these choices in Google’s hands;
• if traditional campaigns that are already delivering good results are active: in these cases, a PMax would risk cannibalizing the traffic already acquired, without bringing real added value;
• when you want to analyze results in detail: PMax reporting is extremely limited for those who need to understand which assets or channels are performing best;
• during testing or strategic experimentation: if you want to compare channels, messages, or audience segments, Performance Max is not the ideal tool, because it offers limited comparison possibilities.

6. How to Test PMax Without Risks

If you still want to try Performance Max, proceed carefully:

• don’t replace existing campaigns: it is better launch PMax separately with a dedicated budget, alongside other active campaigns;
• set clear objectives: focus on higher-quality conversions if volumes allow;
• closely monitor Google Ads data (supplement via scripts for more insights) and compare it with tools such as Google Analytics or Microsoft Clarity;
• integrate Google Ads with your CRM if possible, to track the full picture of conversions;
• allow time for the algorithm to learn: several weeks, or even months, are often needed for reliable results.

Conclusion: Our Perspective

Performance Max campaigns are undoubtedly an interesting tool and can deliver strong results in certain contexts. However, they’re not the “universal solution” Google tends to present.

In B2B especially—where the goal is generating qualified leads and conversion volumes are smaller—more targeted, controllable campaigns (like Search or well-structured Display) are often more effective.

Our advice: treat PMax as something to test in specific cases, not as a starting point. Always base the choice on your objectives, budget, and company context.

Need help choosing the right campaigns for your goals? Get in touch with our agency for tailored consulting.