Google Ads Performance Max: 18 Months of Real Campaign Data
After managing Performance Max campaigns across 40+ clients, we have data on what works and what doesn't. This is our honest assessment — including when PMax hurts performance.
The Promise vs. The Reality
Google positions Performance Max as the future of advertising. After 18 months managing PMax across 40+ client accounts, our data shows it's powerful in specific contexts and destructive in others. For the broader measurement picture, our guide on first-party data strategy explains how to maintain accuracy regardless of campaign type.
Where PMax Consistently Wins
E-commerce with Google Merchant Center integration: PMax consistently outperforms Shopping campaigns when you have clean product feed data and strong conversion history. Brands with broad product catalogs especially benefit from PMax's ability to match queries across the full funnel.
Where PMax Disappoints
Lead generation campaigns for high-consideration B2B products: PMax's black-box optimization frequently wastes budget on low-intent informational queries. We've seen cost-per-lead increase 40–80% when switching B2B lead gen to PMax without proper negative keyword management. For B2B advertising, LinkedIn Ads often deliver better pipeline quality.
The Brand vs. Non-Brand Budget Leak
PMax will serve brand search traffic without showing it transparently in reports. This inflates conversion rates by attributing brand-intent clicks to PMax. Always run a separate brand campaign and exclude brand terms from PMax using brand exclusions.
Our Recommendation
For e-commerce: run PMax alongside Shopping with a budget limit and monitor search term reports weekly. For lead gen: test PMax against your existing structure for 60 days before committing budget. To get our team managing your Google Ads, start with a free account audit.
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