The short answer

Performance Max asset groups should be organised around products, audiences, creative themes, and reporting needs that actually belong together.

Do not create one giant asset group for the whole catalogue unless the business is genuinely simple. Do not create dozens of tiny asset groups without enough data either. The best structure gives Google useful inputs while giving you enough clarity to manage performance.

What asset groups do

An asset group contains:

Think of an asset group as a themed package. It tells PMax which products, creative, and signals belong together.

When one asset group is enough

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One asset group can work when:

This is often fine for early testing. The risk is that performance becomes hard to diagnose as the account grows.

When to split asset groups

Split asset groups when products differ in ways that affect performance.

Good reasons:

Bad reasons:

Structure should make decisions easier, not just make the account look busier.

Structure by product category

This is the most common ecommerce approach.

Example:

Asset group Products Creative angle
Running shoes Running shoe SKUs Performance, cushioning, speed
Walking shoes Walking shoe SKUs Comfort, support, durability
Trail shoes Trail shoe SKUs Grip, terrain, weather

This works because products, audiences, and messaging are different.

Structure by margin

Margin-based structure helps when revenue and profit tell different stories.

Example:

This prevents low-margin products from quietly absorbing budget under the same target as more profitable products.

Structure by customer intent

Some catalogues have different intent groups.

Example:

Each group may need different messaging and a different performance target.

Structure by seasonality

Seasonal products often need their own logic.

Use separate asset groups or campaigns when:

Seasonal products can distort a broad evergreen asset group.

How to use audience signals

Audience signals should match the asset group.

Useful examples:

Do not use the exact same generic audience signal everywhere unless the catalogue really shares one audience.

Creative asset rules

Creative should match the products.

For each asset group, aim for:

Avoid uploading random generic assets just to complete the setup. Low-quality assets can create weak placements.

Listing group rules

Listing groups should match the asset group strategy.

Check:

Asset group structure without listing group discipline is mostly cosmetic.

Common mistakes

Avoid:

The goal is clarity and better input quality.

A practical naming convention

Use names that explain the logic.

Examples:

Good naming makes audits and reporting faster.