Performance Max Campaigns for Shopping — Setup, Optimization, and Common Issues

You are setting up a Performance Max campaign for the first time and need to understand how it differs from Standard Shopping campaigns

Your Performance Max campaign is live but underperforming — spending budget without generating sufficient conversions or ROAS

Your products are showing on irrelevant placements (YouTube, Display Network) instead of Google Shopping where they convert best

A linked Google Merchant Center account with an approved product feed — PMax pulls product data directly from your feed

Conversion tracking properly set up with meaningful conversion actions (purchases, not just page views) — PMax optimizes toward your conversion goals

Asset groups with at least 5 headlines, 5 descriptions, 5 images, and 1 video — Google uses these to create ads across all channels

A sufficient budget for the learning period — Google recommends at least 10-15x your target CPA as a daily budget during the first 2-4 weeks

Audience signals configured to guide Google's AI toward your ideal customers — these are suggestions, not restrictions

Not providing enough assets (images, videos, headlines) — PMax needs creative variety to optimize across channels

Setting a target ROAS or CPA too aggressively from the start, causing the campaign to barely spend and not gather enough data to optimize

Not using audience signals — while PMax will find audiences on its own, signals dramatically speed up the learning period

Running PMax alongside a Standard Shopping campaign targeting the same products — PMax will cannibalize the Standard Shopping campaign

Not segmenting products into separate asset groups for different product categories, leading to budget allocation problems

Verify your Merchant Center feed is healthy: check Products > Diagnostics for disapprovals and ensure all products have high-quality images, accurate titles, and correct pricing

Set up conversion tracking: install the Google tag on your site, create a purchase conversion action with dynamic revenue values, and verify conversions are recording in Google Ads

Create asset groups strategically: group products by category (e.g., one asset group for shoes, another for accessories) with tailored headlines, descriptions, and images for each group

Configure audience signals: add your customer lists, website visitors, and in-market/affinity audiences relevant to your products — this helps PMax find buyers faster

Set your bidding strategy: start with 'Maximize Conversions' for the first 2-4 weeks to gather data, then switch to 'Maximize Conversion Value' with a target ROAS once you have 30+ conversions

Monitor the Insights tab in your PMax campaign: check which search themes, audiences, and asset combinations are driving results and adjust your assets accordingly

Exclude underperforming placements if needed: use account-level placement exclusions to remove low-quality Display or YouTube placements that waste budget