Performance Max Best Practices: Feed, Assets and Signals That Actually Work

Performance Max can feel like a black box. You give Google a budget, some headlines, images and a product feed, and it decides where your ads appear across Search, YouTube, Display, Discover, Gmail and Maps. That automation is powerful, but it is not magic. Campaigns work best when you give Google clear goals, strong creative, good data and enough time to learn. This guide explains how to do that, without giving up all control.

What Performance Max is, and what it is not

Performance Max is a goal-based campaign type. Instead of choosing keywords and placements yourself, you set a conversion goal, a budget and asset groups, and Google uses signals to find people likely to convert. That makes it useful for online sales, lead generation and store visits, especially when you have a product feed or a strong website. It is not a replacement for a well-built Search campaign when you need precise control over exact searches, budgets by service, or location-specific messages.

A helpful way to think about it is coverage plus control. Search captures people who already know what they want. Performance Max can also reach people earlier, on YouTube or Discover, and can fill gaps in Search when your keyword coverage is incomplete. Many businesses run both: Search for high-intent terms they must own, and Performance Max for incremental reach and product discovery. The campaign types guide compares these options side by side.

Start with one clear goal and clean conversion tracking

Do not launch Performance Max with every possible conversion counted equally. If purchases matter most, make purchases the primary conversion. If qualified leads matter, define what counts as qualified, such as a form submission with a valid phone number, not just a page view. When Google optimises for the wrong action, it will happily deliver more of it, and your cost per sale can rise while your reports look successful.

Check tracking before launch, especially for e-commerce. Product revenue should be passed correctly, refunds and cancellations should be understood, and the value of each conversion should reflect real profit, not just revenue. Use the conversion tracking guide and the ROAS and Profit Calculator to test whether a target return on ad spend actually leaves profit after product costs, shipping and fees.

Build asset groups by theme, not by everything you sell

An asset group is a set of headlines, descriptions, images, videos and audience signals for one theme. Do not put your entire catalogue in one asset group with generic headlines. A clothing shop should separate dresses, shoes and coats, or new arrivals, best sellers and sale items. Each group gets headlines that mention that theme, images that show it, and a final URL that lands on that category, not the home page.

Provide the maximum useful assets: up to 15 headlines, five descriptions, several images in landscape and square formats, logos, and at least one video if you can. If you do not supply a video, Google may create one automatically from your images, which is better than nothing but rarely as good as a short, real product video. Test asset performance after a few weeks and replace low-rated headlines and images, rather than deleting the whole group.

Feed quality matters more than feed size

For Shopping and Performance Max, your product feed is your ad copy. Clear product titles, accurate prices, correct availability, good images and complete attributes such as size, colour and brand make your ads more likely to appear for relevant searches and more likely to be clicked by buyers. A feed with 500 poorly titled products will often perform worse than a feed with 100 well-titled best sellers.

Write titles the way customers search, with the product type first and the key detail second, for example Running Shoes for Women, Lightweight Road Running, Size 8, rather than a cryptic internal code. Fix disapproved products promptly, remove out-of-stock items from the feed where possible, and use custom labels to separate best sellers, high-margin products and clearance stock. That lets you create separate asset groups or campaigns with different targets for each group.

Audience signals are a starting point, not a fence

Audience signals tell Google where to start looking, but Performance Max can go beyond them. Useful signals include your customer list, website visitors, people who searched for related terms, and in-market audiences for your category. For a local business, add location signals and service-related interests. For a new business with no list, start with in-market and search-theme signals, then let performance data guide you.

Search themes are especially useful. They are phrases that describe what you sell, and they help Google understand intent when you have no keyword list. Add 20 to 50 relevant search themes per asset group, focused on real customer language. Avoid adding competitor brand names you do not want to chase, and avoid overly broad themes that will pull in irrelevant traffic. Review the insights report regularly to see which search categories are actually driving conversions.

Budget, bidding and patience

Performance Max needs enough budget and time to learn. A very small daily budget spread across many asset groups will learn slowly and produce noisy results. Start with one or two asset groups, a budget you can sustain for at least 30 days, and a target cost per acquisition or target return on ad spend based on real margins, not a guess. If you set a target that is too aggressive, the campaign may spend very little. If you set it too loose, it may spend quickly without profit.

Give the campaign at least two to four weeks before making major changes, unless spend is clearly out of control. Check asset ratings, search categories, and conversion value, not just clicks. When one asset group consistently outperforms another, shift budget gradually, perhaps 20 percent at a time, and test new headlines or images in the weaker group before pausing it entirely.

Performance Max checklist

• One primary conversion goal, with value tracked correctly.
• Asset groups by theme, each with its own landing page.
• Full headlines, descriptions, images, logos and a video where possible.
• A clean, accurate product feed, with best sellers labelled clearly.
• Audience signals from customers, visitors and relevant search themes.
• A realistic budget for at least 30 days, with a margin-based target.
• Weekly checks on assets, search categories and conversion value.
• A Search campaign running alongside, for high-intent terms you must control.

Next, read the bidding strategies guide, plan numbers with the Budget Calculator, and browse the guides index for the campaign type that fits your next goal.

When Performance Max underperforms

If a Performance Max campaign spends little, check three things first: whether the target is too strict for the budget, whether conversion tracking is actually recording conversions, and whether the feed or final URLs are broken. If it spends a lot without sales, check whether the primary conversion is too easy, such as a page view or a newsletter sign-up, and whether the asset group mixes unrelated products. In both cases, fix one variable at a time and wait a week before judging the result. Constantly changing budgets, targets and assets resets learning and makes it impossible to know what helped.

Also watch for brand cannibalisation. Performance Max can show for searches for your own brand, which may look like cheap conversions but would have happened through a regular Search ad or organic result anyway. If brand searches dominate, consider excluding brand terms where possible, or compare incremental results by looking at total business performance, not just the campaign report. A campaign that looks efficient in isolation can still add little overall value if it only captures demand you already owned.