Quick Wins When It Comes To Optimising A Google Ads PMAX Campaign

Performance Max campaigns have transformed the Google Ads landscape, offering advertisers access to all of Google's inventory through a single campaign type. However, many businesses launch PMAX campaigns and then wait weeks for results whilst bleeding budget unnecessarily. The truth is, there are several immediate optimisations you can implement that will start improving performance within days rather than weeks.

If you've been running a PMAX campaign for more than a few days, these quick wins will help you squeeze better results from your existing setup without starting from scratch.

Audit Your Asset Performance Right Now

Most advertisers upload their creative assets and forget about them, but Google provides detailed performance data for each headline, description, and image you've provided. Within your asset groups, you can see which combinations are driving the most impressions and conversions.

A client recently discovered that one of their five headlines was receiving 60% of all impressions but converting at half the rate of their other headlines. Simply pausing that underperforming headline and replacing it with a variation of their best performer increased their conversion rate by 23% within four days.

Quick fix: Navigate to your asset groups, check the performance column for each asset, and pause anything showing 'Low' performance. Replace poor performers with variations of your best assets.

Exclude Your Worst-Performing Placements

PMAX campaigns can appear across YouTube, Discovery, Gmail, and countless websites within the Display Network. Whilst Google's algorithm learns over time, you can accelerate this process by manually excluding placements that are eating your budget without delivering results.

In your placement reports, look for websites or YouTube channels that have generated significant clicks but zero conversions. One agency found that a gaming website was consuming 15% of their client's daily budget with a 0% conversion rate. Excluding just three similar placements freed up budget that was then redistributed to higher-converting inventory, improving overall ROAS by 31%.

Quick fix: Go to Insights and Reports, select 'Where ads showed', and add negative placements for any sites with high spend but no conversions after at least 50 clicks.

Refine Your Audience Signals Immediately

Audience signals are your way of guiding Google's machine learning during the initial learning phase. Many advertisers either provide too few signals or include audiences that don't actually convert for their business.

Instead of broad demographics, focus on behavioural signals. If you're selling premium kitchen appliances, don't just target 'homeowners aged 35-54'. Include audiences like 'recently searched for kitchen renovation', 'visited home improvement websites', or upload a customer list of previous buyers.

A home services company switched from generic demographic targeting to behaviour-based signals (people who had recently searched for their specific services) and saw their cost per conversion drop by 28% in the first week.

Quick fix: Review your audience signals and remove any broad demographic audiences. Replace them with intent-based audiences or customer match lists that represent people who actually buy from you.

Implement Negative Keywords Strategically

Unlike traditional Search campaigns, PMAX negative keywords work differently and should be used sparingly. However, there are certain searches where you definitely don't want to appear, particularly if you're in a competitive industry with multiple meanings.

A luxury watch retailer was appearing for searches like 'cheap watches under £20' and 'free watch repair'. Adding negative keywords for 'cheap', 'free', 'under £X', and 'repair' immediately improved their traffic quality and reduced wasted spend by 18%.

Quick fix: Add negative keywords for terms that clearly indicate low purchase intent: 'free', 'cheap', 'jobs', 'careers', 'repair', 'broken', and any competitor brand names you don't want to target.

Adjust Your Bidding Strategy Based on Early Data

Many advertisers stick with 'Maximise Conversions' throughout their campaign's lifetime, but switching to 'Target ROAS' or 'Target CPA' once you have sufficient conversion data can dramatically improve efficiency.

The key is timing. Wait until you have at least 30 conversions in a 30-day period, then set your target based on your current performance. If you're achieving a 400% ROAS, set your target at 350% to allow Google some flexibility whilst improving volume.

Quick fix: If you have 30+ conversions in the last month, switch from 'Maximise Conversions' to 'Target ROAS' set at 10-15% below your current performance level.

The Reality of PMAX Optimisation

These optimisations won't transform a fundamentally flawed campaign, but they can significantly improve the performance of campaigns that have the right foundation. The most successful PMAX campaigns combine these tactical quick wins with longer-term strategic thinking about creative testing, landing page optimisation, and conversion tracking setup.

Start with these immediate fixes today, then monitor your performance closely over the next week. You should see improvements in key metrics within 3-5 days as Google's algorithm adapts to your optimisations.