Performance Max is a black box. Here's how we run it profitably anyway.

Performance Max was sold to us as “fully automated” — Google will find your customers. In practice, PMax campaigns cannibalize brand search, show ads to bots on random placements, and give you almost zero visibility into where your money goes.

But it does work. Here’s our current framework.

1. Exclude brand search — always

PMax will happily bid on your own brand keywords and take credit for conversions you would’ve gotten for free. Exclude branded terms at the account level.

Google Ads → Campaigns → Brand exclusions → Add your brand terms

2. Feed Google first-party data

Without inputs, PMax flies blind. Feed it:

Customer Match lists — your best-converting past customers (top 20% by order value)
Conversion values — not just “lead” or “purchase” but actual revenue values
Offline conversions — if you have a sales cycle, upload closed-won deals via Google Ads API

First-party signals are the single biggest difference between profitable and wasteful PMax.

3. Audience signals ≠ audience targeting

Audience signals are a suggestion, not a lock. PMax will still serve outside your signals if the algo thinks it’ll convert. Use signals to push in the right direction but don’t expect strict targeting.

4. Separate by margin, not product

Create separate asset groups by gross margin, not by product line. Why? Because PMax optimizes for conversion volume, not profit. Put high-margin SKUs in their own asset group with higher tROAS targets.

5. Monitor placements weekly

Use this script to pull PMax placements weekly:

// Run in Google Ads scripts → Bulk actions → Scripts
function main() {
  var query = "SELECT campaign.name, detail_placement_view.placement " +
              "FROM detail_placement_view " +
              "WHERE campaign.advertising_channel_type = 'PERFORMANCE_MAX' " +
              "AND segments.date DURING LAST_7_DAYS";
  // ...export to Sheets and filter bad placements
}

Exclude placements like youtube.com/mobile-app and known low-quality display networks.

When PMax is the right choice

eCommerce with clean Merchant Center feed and wide product catalog
High-intent keywords already maxed out on search
Sufficient conversion volume (>30 conversions/month minimum)

When to avoid PMax

Lead-gen with long sales cycle and no offline conversion upload
Brands where brand search is a big % of paid volume
Accounts with poor conversion tracking — garbage in, garbage out

Book an audit and we’ll review your PMax campaigns — free, no pitch.