Performance Max in 2025: When to Use It and When to Avoid It

What Performance Max Actually Is

Performance Max (PMax) is a single campaign type that runs across all Google inventory: Search, Shopping, Display, YouTube, Gmail, Discover, and Maps. You provide asset groups (headlines, descriptions, images, videos) and audience signals, and Google's algorithm allocates budget across channels to maximise conversions.

It replaced Smart Shopping campaigns in 2022. Since then, it has become Google's default recommendation for e-commerce — but "default recommendation" is not the same as "always the right choice".

When PMax Works Well

PMax performs best when:

You have sufficient conversion data. PMax needs at least 30–50 conversions per month to exit the learning phase effectively. Below this, its optimisation is essentially random.

Your creative assets are genuinely strong. PMax uses your assets across YouTube, Display and Discover. Weak imagery or generic headlines generate low-quality impressions at wasted cost.

You are expanding, not defending. PMax is designed to find new customers. If your goal is to protect branded search terms or harvest existing demand, standard Search campaigns do this better and more cheaply.

You have a large product catalogue. Feed-based PMax for Retail is excellent for e-commerce brands with 100+ SKUs. Google can find the right product for each search intent.

When PMax Cannibalises Your Results

This is where most brands get burned. PMax will prioritise branded search terms — queries where users search your brand name — and take credit for those conversions. These are the cheapest, highest-intent conversions in your account, and they would have happened anyway.

The result: inflated PMax ROAS, cannibalised branded campaigns, and no genuine incremental growth.

Fix: Create a brand exclusion list in PMax campaign settings. Add all branded keyword variations as negative keywords at the account level. This forces PMax to find genuinely new customers rather than scooping up existing demand.

Also watch for PMax bidding against your own standard Shopping or Search campaigns. Use campaign-level priorities and separate budgets to prevent internal auction competition.

Asset Groups: The Most Neglected Lever

Most brands set up one asset group and forget it. This is a significant missed opportunity.

Structure asset groups by audience intent, not by product category. Examples:

- Asset group 1: New visitors — problem-aware messaging, broad hooks

- Asset group 2: Competitor audience signals — comparison messaging, differentiation

- Asset group 3: Past website visitors (via audience signal) — trust-building, reviews, guarantees

Each asset group should have a minimum of: 15 headlines, 4 descriptions, 5 images (at least 3 ratios), 1 YouTube video (even a 30-second product demo). Google reports asset performance as "Low / Good / Best" — replace any "Low" asset within 14 days.

For Retail PMax, your product feed quality is the single biggest performance variable. Optimise titles, images, and descriptions before touching bids.

The Structure We Recommend for Most Accounts

For a brand with £5K–£30K/month in Google Ads spend:

1. Branded Search campaign (exact match, protect your brand terms, low CPC)

2. Non-branded Search campaign (high-intent terms, manual CPC or Target CPA)

3. PMax campaign — with brand exclusions, segmented asset groups, minimum 50 monthly conversions before trusting its optimisation

4. YouTube campaign (separate, for awareness at the top of funnel) — optional, for brands above £15K/month

This structure gives you visibility into what is actually driving growth versus what PMax is quietly taking credit for.