Performance Max Campaigns: Everything Small Businesses Should Know

Performance Max is Google's headline campaign type. One campaign that spreads across Search, Display, YouTube, Discover, Gmail and Maps, all bidded for automatically by Google's machine learning. The pitch is irresistible: feed it your goals and budget, let Google figure out the rest.

The reality, especially for small business advertisers, is more nuanced. Performance Max can work brilliantly. It can also burn through £3,000 with nothing to show for it. The difference comes down to how you set it up and how much control you keep.

What Performance Max Actually Is

Performance Max replaces the older Smart Shopping and Local campaign types and partially replaces Display campaigns. Instead of choosing where your ads run, you give Google your conversion goal and your creative assets. Google decides where to show ads, what audience to target, and how much to bid.

You feed it: text headlines and descriptions, images, videos, logos, audience signals (suggestions, not strict targeting), and optionally a product feed if you sell physical goods.

Google takes those inputs and runs ads everywhere across its network.

When Performance Max Works Well

Performance Max is most effective when three conditions are true:

When Performance Max Hurts

Performance Max can be a disaster in three situations:

• You have a small, defined audience. A local boiler repair business will see Performance Max showing ads to people across the country, even with location targeting.
• Your conversion tracking is weak. If you cannot tell Google what a good lead looks like, it will optimise toward bad ones.
• You want control over what runs where. Performance Max is a black box. You get aggregated reporting, not channel level detail.

The Asset Group Strategy

Inside Performance Max you organise everything into "asset groups". Each asset group is a theme with its own creative and audience signals. Most small businesses make the mistake of running one giant asset group with everything thrown in. That is the wrong move.

Instead, build asset groups by theme:

Asset Group	What Goes In
Service A	Headlines, descriptions, images about Service A only
Service B	Service B specific assets
Customer Type 1	Assets that speak to small business owners
Customer Type 2	Assets that speak to homeowners

Three to five asset groups per campaign. Each one tightly themed.

The Hidden Lever: Audience Signals

Audience signals are not strict targeting. They are hints to Google about who you think your customers are. Google then expands beyond them. Most advertisers ignore this section. Do not. Give Google three to five audience signals per asset group:

• Your existing customer lists uploaded as a Customer Match audience
• Your website visitors from the last 90 days
• In market audiences for relevant categories (e.g. "Home Heating Repair Services")
• Custom segments based on competitor keywords or competitor websites

Negative Keywords on Performance Max

This was the biggest historical complaint about Performance Max. Until 2024, you could not add negative keywords. Google has fixed this. You can now add negative keywords directly inside Performance Max campaigns. Use this aggressively, especially in the first 60 days:

1. Open the Insights tab in your Performance Max campaign
2. Look at "Search themes" and "Search categories"
3. For anything irrelevant, add the obvious words as negative keywords
4. Repeat weekly for the first 8 weeks

Bidding Strategy Choices

Performance Max only supports automated bidding. You have two choices:

• Maximise Conversions: Spend the budget, get the most conversions. Use when you do not have a target cost per acquisition yet.
• Target CPA: Spend within a defined cost per conversion. Use once you know what a good lead costs (after 60 to 90 days of data).
• Maximise Conversion Value: For e-commerce, where some conversions are worth more than others. Requires conversion value tracking.
• Target ROAS: For e-commerce. Spend whatever it takes to hit your target return on ad spend.

Start with Maximise Conversions. Switch to Target CPA after 60 days and 30 plus conversions in the campaign.

Reporting Hacks for Performance Max

Performance Max reporting is famously thin. Three tricks to get useful detail back:

1. Asset group level reporting. Click into the campaign, then "Asset groups". You can see performance per group, which is the closest thing to channel level reporting.
2. Insights tab, Audiences. Shows which audience signals Google is leaning into.
3. Custom scripts. The community has built Google Ads scripts that pull placement and search term data from Performance Max. Use one if you can.

Should a Small Service Business Use It?

For local service businesses, we usually recommend running a standard Search campaign first, get it producing leads at a known cost, then add Performance Max alongside it once you have at least 50 conversions a month.

For e-commerce, Performance Max is usually the right starting point because it replaces what Smart Shopping used to do, and the product feed gives Google something solid to work with.