How to improve ROAS in Performance Max

Performance Max is a powerful tool in Google Ads that combines all channels of the Google ecosystem: search, YouTube, display, Gmail and Discover. But with the possibilities come challenges – especially when it comes to control and analytics.

Many advertisers call Performance Max a “black box” due to:

• excessive automation,
• limited transparency,
• reduced number of management levers compared to classic campaigns.

However, this does not mean that auditing is no longer relevant. It is simply that the focus of auditing has changed: now it is important to analyze not only the results, but also the input data on which the algorithm is based.

In this article, we have put together a structured audit checklist for Performance Max that will help you better understand what is really happening with your campaigns – and which levers you should check and adjust to achieve higher performance.

Technical setup and tracking

Check your conversion tracking settings (gtag.js and Google Ads tags)

How to check:

• Use Google Tag Assistant Legacy or the Goals → Diagnostics section in Google Ads to check if your tags are firing correctly.

Why it matters:
Accurate conversion tracking is the foundation of Performance Max’s machine learning algorithms. If the data is inaccurate, the optimization will be incorrect.

Make sure Enhanced Conversions is set up

How to check:

• Go to Google Ads → Goals → Diagnostics to make sure Enhanced Tracking is enabled.

Why it matters:
Enhanced conversions allow you to better track user actions using first-party data. This is critical in a world of increasing privacy restrictions.

Check your attribution model – it should be Data-driven

How to check:

• In Google Ads: Tools → Measurement → Attribution models. Make sure Data-driven is selected as the default model.

Why it matters:
This model analyzes the impact of each touchpoint on the path to conversion. Without it, Performance Max will not be able to effectively account for the impact of the upper part of the funnel (such as video or display ads).

Check the link between GA4 and Google Ads

How to check:

• In GA4: Admin → Product Links → Google Ads. Make sure the accounts are linked and data is being transferred (check in real-time reports).

Why it’s important:
GA4 gives the system additional signals about user behavior, even if they don’t convert. This allows Performance Max to better optimize campaigns.

If you work with leads, check the quality and value of the data you’re sending

How to check:

• Check if your CRM or lead management system is integrated with Google Ads via offline conversion import or API.
• Make sure that you’re sending not only lead capture data, but also quality data (e.g. deal status, funnel stage, etc.).

Why it’s important:
Performance Max can not only increase the number of leads, but also optimize campaigns for value. This is especially important for B2B and high-value B2C products, where not every lead is equally valuable.

Merchant Center and Feed Management: The Foundation of Performance Max Performance

Performance Max actively uses data from Google Merchant Center to create dynamic ads, including Shopping Ads, Discover, Gmail, YouTube, and other formats. Therefore, properly setting up and optimizing your product feed is critical for effective campaign performance.

Below is a list of key points to check during an audit.

Check if Merchant Center is connected to Google Ads

How to check:

• In Google Ads: Tools → Data Manager → Connected Products → Google Merchant Center.
• Or in Merchant Center itself: Settings (gear icon) → Linked accounts / Apps & services.

Why this is important:
Without proper synchronization, Performance Max will not be able to use product data to generate ads. This is the foundation for eCommerce advertising in the Google ecosystem.

Check feed quality: optimized titles, short titles, lifestyle images

How to check:

• Go to Merchant Center → Products → All products → Check attributes: title, description, short_title, lifestyle_image_link.
• Compare with Google’s optimization guidelines for Gmail/Discovery/YouTube.

Why it matters:
The better and more relevant your feed is, the better the ad options Google’s AI will generate. This expands your potential reach at the top of the funnel.

Use custom labels to segment products

For example:

• One label for high-margin products.
• Another for promotional offers or seasonal sales.

How to check:

In Merchant Center, look at the attributes custom_label_0 to custom_label_4 in your product feed.
Ensure they’re used consistently and reflect your business logic.

Why it matters:

Custom labels allow you to:

• Segment products for more precise management.
• Vary bids based on product type.
• Allocate budgets to strategically important groups (e.g. bestsellers, new arrivals, or low-inventory items).

Ensure your feed Is updated regularly

How to check:

In Merchant Center:
Go to Products → Data Sources → Primary Feed, and check the update schedule.

If you’re using dynamic inventory, enable Automatic item updates.

Why it matters:

An up-to-date feed:

• Prevents the display of outdated pricing or availability.
• Reduces bounce rates.
• Optimizes spend by excluding irrelevant impressions.

Check that Top-Selling products are not disapproved

How to check:

In Merchant Center:
Go to Products → Diagnostics → Filter by “Disapproved” status.
Sort by clicks or conversions, if available.
Cross-reference with your internal sales reports.

Why it matters:

Performance Max cannot promote disapproved products.
If your top sellers are among them, you’re losing both sales and ad budget.

Check that Top-Selling products are not out of stock

How to check:

In Merchant Center:
Go to Products → Diagnostics → Filter for “Out of stock”.
Compare with your top-selling product data.

Why it matters:

Google won’t show ads for products that are out of stock.
Trying to promote them can result in:

• Frustrated customers
• Wasted ad spend
• Lower overall campaign performance

Campaign Structure and Settings: Order in the System — Efficiency in Results

One of the most common mistakes when working with Performance Max is having a chaotic campaign structure — or no structure at all. Despite automation, it’s proper planning that determines how effectively Google’s AI will manage your budget.

Check the structure of existing PMax campaigns

How to check:

In Google Ads, open the list of your Performance Max campaigns.

Analyze:

• Campaign names (do they reflect the theme?)
• Search themes
• Focus of each asset group
• Whether campaigns are tied to specific product categories, services, or conversion goals

Why it’s important:

A well-designed structure:

• Enables better budget allocation
• Provides easier goal segmentation
• Improves reporting
• Reduces internal competition between your campaigns

Pro tip:
Group similar products within a single PMax campaign, but split them into different asset groups — this way, Google can optimize without keyword cannibalization.

If you’re using separate campaigns with different ROAS targets, monitor search term overlap closely, or your campaigns may end up competing with each other.

Ensure standard Search campaigns are running steadily

How to check:

In Google Ads, review the status of your Search campaigns.

Evaluate:

• Impressions
• Clicks
• Conversions
• Cost per conversion (CPC)
• Return on ad spend (ROAS)

Why it’s important:

Even if Performance Max is your primary campaign type, standard Search campaigns:

• Provide historical data
• Help train machine learning algorithms
• Offer audience signals PMax can use for better optimization

Check advanced location targeting: “Presence in location”

How to check:

In your PMax campaign settings → Locations → Location options (advanced),
Ensure “Presence: People in or regularly in your targeted locations” is selected.

Why it’s important:
This type of geo-targeting helps:

• Avoid showing ads to people merely interested in your location
• Focus on truly relevant users
• Minimize wasted ad spend

For lead generation: Check that UTM parameters are used in asset groups

How to check:

Open each asset group → Review final URLs or tracking templates.
Ensure UTM tags like utm_source, utm_medium, utm_campaign, utm_content are consistently applied.

Why it’s important:

UTM parameters are critical for:

• Accurate CRM analytics
• Identifying the best-performing asset groups
• Filtering out spam and low-quality leads

In Performance Max lead gen campaigns, UTM tags are often the only reliable way to connect lead source to lead quality — without them, you’re flying blind.

Creatives, Audiences & UX: The Heart of Performance Max

In Performance Max, creatives and audiences aren’t just “add-ons” — they’re core elements of success. The quality of your creative inputs and the precision of your audience signals directly affect how well Google’s AI will optimize your ads. And let’s not forget — all traffic ends up on your website, so the user experience there must be flawless.

Check the variety of your asset groups

How to check:

Within each PMax campaign, open the asset groups and ensure you’ve added:

• Headlines
• Long headlines
• Descriptions
• Images (in various formats and aspect ratios)
• Videos

Why it’s important:

Google treats asset groups like Tetris blocks — building the best combination for each situation.
The more high-quality and diverse your inputs are, the more combinations the AI can generate across placements, audiences, and funnel stages.

Bonus: This directly affects the Ad Strength score, which Google uses as a predictive performance indicator.

Check for strong calls-to-action (CTAs)

How to check:

Within asset groups, review the CTA language in your headlines and descriptions.

Is there a clear, action-oriented phrase like:
“Order now,” “Learn more,” or “Get your discount”?

Why it’s important:

A strong CTA isn’t just a detail — it’s the trigger that gets users to act.
In many cases, simply updating the CTA has led to up to a 30% increase in conversions.

Check for relevant ad extensions

How to check:

In Google Ads, go to Assets → Asset coverage tab.

Review which extensions (e.g., sitelinks, callouts, phone numbers) are attached to your campaigns.

Why it’s important:

Extensions:

• Increase ad size
• Improve visibility in the SERP
• Provide more interaction points

They also act as additional signals that help machine learning better understand which users to target.

Use Customer Match audiences

How to check:

Go to Tools → Shared Library → Audience Manager → Customer Lists.

Make sure you’ve uploaded a list of your existing customers, and that it has a strong match rate.

Why it’s important:

Customer Match is one of the strongest audience signals in Google Ads.
You’re literally giving Google a list of people who already bought from you — and the AI goes out and finds similar users.

Perfect for lookalike targeting with minimal testing required.

Add custom segments based on converting keywords

How to check:

Navigate to Tools → Shared Library → Audience Manager → Custom Segments.

Check if there’s a segment built around search terms that previously led to conversions.

Why it’s important:

You’re telling the algorithm:
“These are the queries that already converted — go find more users with similar intent.”

This improves efficiency by giving Performance Max proven behavioral signals to act on.

Website and Landing Pages: Where Conversions Are Won or Lost

Even the best ad won’t work if the website is slow, confusing, or has broken forms. PMax sends the traffic — but what happens next is fully in the hands of your UX.

Check Your Site’s Mobile Friendliness

How to check:
Use Google’s Mobile-Friendly Test.
Also, manually browse your site on different smartphones.

Why it matters:
Most Performance Max impressions come from mobile. Poor mobile UX → high bounce rate → negative signals to Google → weaker performance.

Test Forms and Checkout Flows

How to check:
Test all lead capture forms (on the homepage, landing pages, popups).
Test all “Add to Cart” buttons and the entire checkout process.
Test across major browsers (Chrome, Safari, Firefox) and devices.

Why it matters:
One broken form = lost data. Google won’t know a user wanted to convert → no learning → wasted ad spend.
Also, make sure GA4 events like submit, begin_checkout, and add_to_cart are firing — these give Smart Bidding more signals to optimize.

Exclusions, Reports & Insights: Your Final Performance Max Check

Once your main campaign setup is in place, the last step is to assess how well your campaign is controlled, predictable, and manageable. This means reviewing exclusions, creative quality, and Google’s own insight reports.

Brand Exclusions (if you run separate brand campaigns)

How to check:
Google Ads → Your PMax campaign → Additional settings → Brand exclusions.
Check whether the option “Allow Shopping ads on brand queries” is enabled.

Why it matters:
If you have a dedicated branded campaign (e.g. in Search), excluding your brand from PMax avoids cannibalization.
At the same time, allowing branded Shopping ads lets you capture high-intent queries through PMax — without sacrificing efficiency.

Review Creative Quality and Rotation

How to check:
PMax → Asset groups → View details.
Look at the Performance column — any assets marked “Low” or “Poor”?

Why it matters:
Weak creatives pull down your entire campaign. Routinely updating headlines, descriptions, or images is a key part of ongoing optimization.

Review Campaign Change History (Bidding and Budgets)

How to check:
Google Ads → Change history → Filter for Bidding and Budget changes.

Why it matters:
You’ll see how actively and thoughtfully adjustments are being made. If bidding strategies or budgets are rarely or erratically changed, that’s a red flag.

Review the Channel Performance Report

How to check:
PMax campaign → Insights and Reports → Channel performance.

Why it matters:
While you can’t directly control spend across Search, YouTube, or Gmail, this report shows which channels are performing.
Use it to:

• Identify weak creative performance per channel
• Decide where to expand or scale back

Review Audience Insights

How to check:
PMax campaign → Insights and Reports → Audience insights.

Why it matters:
Audience data (age, interests, behavior) is gold for:

• Launching new products
• Building segmentation strategies
• Shaping your value proposition

“Optimized” segments are particularly valuable — these are found by Google based on your performance.

Explore Suggested Trends and Explanations

How to check:
Insights → Suggested Trends or Explanations (hover over blue dotted-line metrics).

Why it matters:
Suggested Trends = demand forecasts → plan content, promotions, inventory in advance.
Explanations = why performance changed → no more guessing, just clarity.

Review Seasonal Bid Adjustments

How to check:
Tools → Budgets and Bidding → Adjustments → Seasonal tab.

Why it matters:
If you’re not using seasonal adjustments, Google won’t understand why your conversion rate spiked.
With correct adjustments, the AI can properly optimize for holidays, promos, or sales peaks.

Auditors: The Missing Link in Performance Max Success

Performance Max has reshaped paid search — combining automation with the power of Google AI. But marketers still have a crucial role.

We no longer “micromanage” every lever — we guide the system strategically. That means:

• Ensuring high-quality creative and data inputs
• Tracking accuracy
• Campaign alignment with business goals

Our mission? Don’t fight automation — make it work better by giving it the right environment.

This Checklist Isn’t Just a List — It’s a Framework

It breaks down a complex system into manageable parts:

• Technical setup
• Merchant Center and feed
• Campaign structure
• Creatives and audiences
• UX
• Insights and reporting

You don’t need to do everything at once. Start with what matters most — and you’ll already be ahead.

Automation ≠ Lack of Control

Even in the era of machine learning, the human factor is irreplaceable. We, the PPC pros, are here to:

• Interpret system behavior
• Discover what works (and what doesn’t)
• Deliver clear insights to clients
• Pivot strategies when needed

Because in the end, it’s thoughtful audits + strategic flexibility that turn tools into results.

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