Performance Max Not Working? How to Diagnose and Improve Results

Diagnose before you change anything

When performance max is underperforming, the instinct is often to increase the budget or make sweeping changes. In most cases the better approach is to diagnose the specific problem first. There are several distinct reasons campaigns fail and the fix for each is different. Work through this guide before touching your settings.

Check conversion tracking first

Before drawing any conclusions, verify your conversion tracking is working correctly. It is surprisingly common to find that conversions are not being recorded accurately, which makes campaigns appear to underperform when they may actually be generating results.

In Google Ads, navigate to Tools and Settings, then Measurement, then Conversions. Check each conversion action is recording and firing correctly. A simple test — completing your own contact form or making a test purchase — confirms whether tracking is working end to end. This takes five minutes and frequently resolves what looks like a performance problem.

Review your search terms report

The search terms report shows exactly what people typed before clicking your ad. This is one of the most valuable diagnostic tools available and is routinely overlooked.

Look for irrelevant searches consuming budget and add them as negative keywords immediately. Also look for high-intent terms that are performing well but may not have dedicated ad groups or matched landing pages — these are quick wins waiting to be captured. Review this report at least weekly.

Evaluate your landing page

A campaign can have strong click-through rates and still fail to convert if the landing page does not match the intent of the search. Common landing page issues include slow load times, a lack of a clear call to action, mismatch between the ad message and the page content, and pages that are not mobile-optimised.

Check load speed with Google PageSpeed Insights. Review the page as a first-time visitor who arrived from a specific search. Is it immediately clear what they should do? Is the value proposition obvious above the fold? Is the form or enquiry process as frictionless as possible?

Check your bidding strategy

Automated bidding strategies require sufficient conversion data to work effectively. If your account is generating fewer than 30 conversions per month, Target CPA or Target ROAS may actively hurt performance because the algorithms do not have enough signal to optimise.

In lower-volume accounts, Maximise Conversions or manual CPC often outperforms smart bidding until you have accumulated sufficient data. If you switched to automated bidding recently and performance dropped, reverting is a reasonable short-term fix.

When to get a professional audit

If you have worked through the above and are still not seeing the results you need, or you simply do not have the time to diagnose issues yourself, a professional audit is a worthwhile investment. A good audit identifies specific problems and gives you a prioritised list of fixes.

We offer free audits for UK businesses. Get in touch and we will take an honest look at your account and tell you exactly what we find — no jargon, no obligation.