Performance Max for Online Stores: When It Works and When It Burns Budget

Performance Max works for an online store when the product feed is clean, conversion value is close to cash collected, and searches for the store's own name are kept apart from it. It burns budget when it is rewarded for sales that would have arrived anyway, or for orders that are refused at the door.

Performance Max is a goal-based Google Ads campaign type that serves ads from one campaign across Search, Shopping, YouTube, Display, Discover, Gmail and Maps, driven by Smart Bidding, your product feed and the creative assets you supply. I treat the number it reports as a claim to take apart before it becomes a reason to spend more. This article belongs to the Google Ads audit checklist, and its platform details are valid as of October 2026.

What is Performance Max, and where do its sales come from?

Performance Max sales come from a mix that the campaign reports as one number: people who searched for your store's name, people who searched for a product without knowing you, and people who saw an ad on YouTube or Discover and came back. The campaign's real value sits in the second and third groups. Much of the first would have reached you through your free listing or a cheap brand campaign.

The store reaches the campaign through its Merchant Center feed: title, image, price, availability. That is why I say the feed is the campaign. Every fault in the feed becomes a fault in the ads, however good the bidding is.

What has to be in place before you launch?

Five conditions, all checkable in a day:

1. Conversion value you can relate to cash. In a store that sells with cash on delivery, an order is recorded before it is paid, and some are refused on delivery. Know that rate from the store report before you give bidding a target.
2. A feed with no account-level issues, best sellers approved, and titles in the language your customers search in, Arabic, English or both.
3. A written decision on your brand name: exclude it from the campaign, or measure its share?
4. Enough conversions to learn from. For Target ROAS on Search and Shopping, Google asks for at least 15 conversions in the past 30 days. I use that as the reference point before setting any ROAS target on Performance Max.
5. A review date. Google recommends reporting values for four weeks or one to two conversion cycles before setting a target. Put the date in the calendar before launch, so nobody judges the campaign on day three.

When does Performance Max burn budget?

In three situations that are common in store accounts:

• When it is rewarded for your brand. If much of the campaign's value comes from terms containing your store's name, a high ROAS is measuring your customers' loyalty, not the campaign.
• When it learns from orders that will be cancelled. Bidding chases whatever you call a conversion. If cancelled and returned orders count at full value, the campaign learns to bring more customers who look like the ones who cancel.
• When one product swallows the spend. The campaign leans toward products that sell easily, one of which may carry a thin margin, while slow-moving products get almost no impressions. The fix starts in the feed; clearing the stock itself is covered in slow-moving stock.

The product feed is the campaign

A good feed tells the campaign what you sell and to whom. Check four things: titles in the words people actually search, in Arabic and English where needed; clean images; price and availability matching the product page; and disapproved products with their reasons, covered in Merchant Center disapproved products.

Then use custom labels. Merchant Center offers five fields, custom_label_0 to custom_label_4, each with up to 1,000 unique values, and Google's own examples include season, clearance, selling rate and margin. My practical setup for a Saudi or Jordanian store: one label for margin in three tiers, one for clearance, one for season (Ramadan, National Day, White Friday). With those labels you can split products into separate asset groups or listing groups, and give clearance items their own budget and target.

What changed in Performance Max reporting in 2025 and 2026?

Performance Max used to be largely a closed box. That changed over the last eighteen months:

Date	Change	What it means for a store
30 April 2025	Google announced the Channel performance page: a campaign summary and a table of clicks, conversions and cost across Search, YouTube, Discover, Gmail, Display, Search partners and Maps, alongside search terms reporting and asset reporting with cost	You can see which channel takes the money and which brings the value
2025	The "Search terms and landing pages for Performance Max" report, with negative keywords at account or campaign level for Search and Shopping inventory	You can measure your brand share and block irrelevant searches
28–29 January 2026	Google Ads API v23 added a channel breakdown for Performance Max at campaign, asset group and asset level, for dates from 1 June 2025; asset group level is API-only	Dashboards built on the API can now see channels
21 September 2026	Reporting connectors, including Supermetrics, began splitting Performance Max rows by network instead of a single "Cross-network" value	Any report filter on "Cross-network" now returns nothing; update it

Should you exclude your brand from Performance Max?

For most stores with real demand for their name, I recommend excluding the brand from Performance Max and running a separate brand Search campaign with a budget that never runs out. Brand exclusions in Performance Max apply to Search and Shopping ads, also cover common misspellings of the name, and let you keep Shopping ads serving on your brand terms if you choose. Google describes this as the recommended setup if you manage brand traffic in a separate campaign.

When would I leave it in? In a new store that almost nobody searches for by name, or where no competitor bids on your name and you want the simplest possible structure. Either way, measure the brand share in the search terms report monthly, and revisit the decision if it crosses a threshold you wrote down in advance.

Performance Max, Standard Shopping or Search?

Campaign type	Suits	Control	When I would choose it for a store in Saudi Arabia or Jordan
Performance Max	Large catalog, clean feed, enough conversions	Low on targeting, better reporting since 2025	After passing the readiness test below
Standard Shopping	Bid control by product group, or testing a feed on a small budget	High on products, Shopping inventory only	New stores, or products that need a strict cost ceiling
Search	Protecting your name, clear-intent terms, high-margin products	Highest	Always for the brand name and your most important product terms

When Performance Max and Standard Shopping compete for the same products, Google says the campaign with the higher Ad Rank serves, so the two do not bid each other up.

Performance Max readiness test

Six conditions. Score one point for each that is met.

#	Condition	How to check	If it fails
1	Conversion value reconciled with cash	Compare a full month of Google Ads conversion value with paid orders in the store report	Calculate your cancellation and return rate and judge the campaign after deducting it
2	Clean feed	No account-level issues in Merchant Center; best sellers approved	Fix the feed before launch
3	Brand decision written	Brand exclusion plus a brand Search campaign, or a written limit on brand share	Measure brand share for two weeks, then decide
4	Custom labels	One label each for margin, clearance and season	Add them in the feed or with Merchant Center rules
5	Conversion volume	At least 15 conversions in 30 days before any ROAS target, per Google's guidance for Search and Shopping	Consolidate products into one campaign, or start with Maximize conversion value and no target
6	Review date	Four weeks or one to two conversion cycles, in the calendar	Do not judge before that date, and do not change the target weekly

Score: 6 of 6: launch. 4 or 5: launch with a date to fix the gap. 3 or less: fix first, because the campaign will learn from bad data.

How should you judge a Performance Max campaign?

Judge it on value not tied to your name, after cancellations and returns, against the break-even ROAS for your margin. Break-even ROAS is 1 divided by gross margin: a store with a 40% margin needs a ROAS of at least 2.5 to avoid losing money on the ads. More in ROAS versus revenue.

Hypothetical example, rounded numbers: a Saudi store with a 40% gross margin. Performance Max reports SAR 168,000 in conversion value on SAR 36,000 of spend, a ROAS of about 4.7.

• From the search terms report: SAR 56,000 of that value came from terms containing the store's name, on SAR 4,000 of spend.
• Non-brand value: SAR 112,000 on SAR 32,000, a ROAS of 3.5.
• After a 10% cancellation and return rate: SAR 100,800, a ROAS of about 3.15.
• Gross profit on those sales: SAR 40,320, leaving SAR 8,320 after ad spend.

The campaign is profitable, but its safety margin is far thinner than 4.7 suggests. The decision to raise the budget rests on 3.15, not 4.7.

Then read the Channel performance page. If Display or YouTube take a large share of spend with little value, review the creative assets and audience signals before judging the whole campaign. And compare the trend in total store sales, not the campaign figure alone.

From my work

At Argan Package in Saudi Arabia, Google Merchant Center delivered a 25% ROI within three months of launch, during my work with the store between April 2024 and December 2025, when I led a team of eight alongside my role at CoderZ. The figure belongs to the channel as a whole, not to one campaign type, so I do not credit it to Performance Max alone. What it supports is the principle this article is built on: the channel starts with the feed.

What to do next

Run the readiness test on your account this week, starting with conditions 1 and 3, because they change how you read every number after them. If your store has not connected Merchant Center yet, or the feed is full of disapprovals, my Merchant Center setup takes at least 72 hours and starts with the health of the feed before any campaign. Want your team trained on this? See training for marketing teams.