Google Tests Channel Controls in Performance Max: What It Means for Advertising

Google gives advertisers more control over Performance Max

Google is testing a new setting in Performance Max campaigns that would, for the first time, let advertisers tell the algorithm directly which channels they value more and which they value less. The feature is currently in what is called alpha testing and includes adjustment controls for Search, YouTube, Display, Discover, Gmail and Maps. This marks a significant shift from the way Performance Max has worked so far, where budget distribution across channels was almost entirely controlled by Google's algorithm.

If the feature rolls out to all advertisers, it will be one of the most important changes Google has introduced to Performance Max. For Slovenian small and medium businesses investing in Google Ads, it brings both a new opportunity and a new responsibility.

What actually happened

The new experimental setting, called "Channels," lets advertisers apply a positive or negative adjustment to an individual Performance Max channel. The change was first spotted by search marketing consultant Heidi Sturrock, who shared it on LinkedIn.

Here's how the system works:

• A positive adjustment loosens the cost per acquisition (CPA) the system is willing to accept for a given channel. This tells the algorithm the advertiser places higher value on conversions coming from that channel.
• A negative adjustment tightens the allowed cost per acquisition, encouraging Performance Max to place less emphasis on that channel.

It's important to understand that this is not the same as assigning a fixed percentage of budget to Search or YouTube. The advertiser does not decide how much money goes where. Instead, they influence the economics Performance Max uses when deciding where to chase conversions. It's a more subtle lever, not a hard limit.

Why this matters

Since its inception, Performance Max has given advertisers very little direct control over how budget is spread across Google's ad inventory. Influence could only be applied indirectly, through creative assets, audience signals, search themes and conversion value data. Google's official documentation has stated clearly that advertisers cannot directly control how Performance Max allocates budget across channels.

The new setting is a logical next step. Google previously introduced channel-level reporting, which gave advertisers visibility into where campaigns were showing up and where money was being spent. This new feature could be the next piece of the puzzle, letting advertisers turn insights from reports into actual influence over the algorithm's behavior. The path is moving from mere visibility toward genuine control.

Background: why advertisers have been waiting years for this

When Google introduced Performance Max, the main promise was automation. Advertisers provided creative assets, goals and signals, and the algorithm handled distribution across all channels at once. This made life easier for many, but it also created a feeling of lost control. Businesses often didn't even know where their budget was going.

As a result, marketers have spent years asking for more control. A common complaint was that Performance Max overinvested in cheaper display inventory or in YouTube, where conversions looked plentiful but weren't necessarily high quality. The new setting could solve exactly this problem, allowing advertisers to correct an unwanted channel distribution without abandoning Performance Max altogether.

The conversion attribution trap

Here lies an important warning. Performance at the channel level is not necessarily the same as the channel's true value. Imagine a user who first discovers your business through a YouTube ad but completes the conversion through Search. If you only look at the channel credited with the conversion, YouTube can look less valuable than it actually is to the overall customer journey.

Aggressively tightening a channel just because its directly attributed CPA looks poor can reduce demand or conversions elsewhere in the campaign. This means the new control also brings a new decision to make during optimization. Before telling the algorithm where to ease off, you need to understand the role each channel plays beyond just the last touch.

What this means for Slovenian small and medium businesses

For a business owner advertising on Google, this news brings two things. On one hand, it's good news, since you'll have more say in where your advertising money goes. On the other hand, the new tool requires knowledge, since careless use can hurt results more than it helps.

Here are some key implications for your business and your website:

• Conversion data quality becomes even more important. If Google isn't measuring conversions correctly, you'll be making decisions based on faulty numbers. Properly configured tracking on your website is the foundation of any successful advertising effort.
• Your website needs to convert visitors. Channel control won't help if the page you're sending visitors to fails to persuade them. A fast, clear, mobile-friendly page is a prerequisite for advertising to make sense.
• Measure customer value, not just conversions. Businesses that understand a customer's actual lifetime value will be better positioned to judge which channel is truly worth investing in.
• The danger of acting too quickly. If you hastily turn down a channel that looks underperforming, you may unintentionally cool off the entire campaign.

If your website isn't yet set up to get the most out of advertising, now is a good time to think it over. At Carpolab, we build fast, clear, conversion-focused websites that actually turn visitors from Google ads into inquiries and orders. If you'd like an estimate for a redesign or a new website, check out our calculator.

Practical advice: get the fundamentals right first, then fine-tune

The new channel controls are interesting, but for most Slovenian small businesses, the bigger impact comes from having the basics in order. Before you start fine-tuning CPA by channel, make sure of the following:

1. Proper measurement. Make sure all meaningful conversions, such as form submissions, calls and purchases, are actually being tracked.
2. A quality landing page. Every ad should lead to a page that precisely matches the ad's promise and quickly guides the visitor toward taking action.
3. Speed and technical soundness. A slow website can ruin even the best campaign, since visitors leave before the page even loads.
4. A clear call to action. Within a few seconds, the visitor should know exactly what to do.

Once these fundamentals are in place, every new Google control, including channel control, works better because it builds on a solid foundation. If you need help with this, reach out to us via our contact page and we'll review where the opportunities lie for your business together.

Carpolab's view: control is welcome, but it's not a magic wand

We believe the direction Google is heading in is the right one. The combination of better reporting and more control is exactly what advertisers have needed. But we caution that control without understanding is not an advantage, it's a risk. Businesses that blindly tighten channels based solely on last-touch data may end up hurting themselves.

For Slovenian businesses, the real takeaway is this: advertising on Google is becoming increasingly dependent on the quality of your data and the quality of your website. The algorithm is only as good as the signals it receives and the page it sends visitors to. Investing in a good website is therefore not a cost, but the foundation of any successful advertising effort.

Frequently asked questions

Do I need to change my Google campaigns right away?

No. The feature is currently in alpha testing and is not available to all advertisers. Before it becomes widely available, focus on the fundamentals: accurate conversion measurement and a quality website that turns visitors into customers.

Does channel control mean I can set an exact budget for each channel?

No. The new setting does not assign fixed budget percentages. Instead, it influences how strictly or loosely the algorithm treats the cost per acquisition for a given channel. It's a form of guidance, not a hard restriction.

What is the biggest risk with this new feature?

The biggest risk is judging a channel only by its directly attributed conversions and tightening it too quickly. Since customers often move through multiple channels on their journey, doing so can unknowingly reduce results across the entire campaign. That's why it's important to understand the full customer journey, not just the last touch.