Google’s Performance Max (PMAX) campaigns promise an automated, all-in-one advertising solution, but they often prioritise quick wins over real customer acquisition. If left unchecked, PMAX can over-focus on low-hanging fruit, spending a disproportionate amount of your budget on branded search terms—converting people who were already likely to buy from you. While this results in impressive ROAS (Return on Ad Spend) metrics, it doesn’t necessarily mean you’re attracting new customers or expanding your market reach.
Another common frustration with PMAX is its tendency to allocate ad spend inefficiently, funnelling money into low-converting placements like display ads. While display advertising has its uses, relying too much on it for conversions can lead to wasteful spending, especially if more effective channels like pay-per-click (PPC) strategies in Google Ads are underutilised.
PMAX is far from useless—it works exceptionally well about 70% of the time. However, the remaining 30% requires hands-on adjustments to get the best results. The challenge lies in making PMAX work for you rather than allowing its automation to dictate your budget allocation blindly. A few key tweaks can dramatically improve how PMAX performs, ensuring that your advertising spend is directed towards high-intent customers and new business opportunities.
Understanding the Limitations of PMAX
PMAX operates across multiple Google properties, including Search, Shopping, Display, YouTube, Discover, and Gmail, using machine learning to determine where to place ads. While this seems ideal in theory, it means that unless it is properly configured, PMAX will default to maximising conversions in the easiest possible way.
The easiest conversions often come from brand searches, where users are already looking for your business or products. While this contributes to revenue, paying for conversions that may have happened organically is not the best use of advertising spend. This is why PMAX often delivers seemingly high ROAS but limited new customer acquisition.
Another common problem with PMAX is how it distributes budget across channels. Many advertisers notice that significant spend gets allocated to display ads, which tend to bring in lower-intent traffic that may not convert at the same rate as search or shopping ads. If left unchecked, this can mean valuable budget is being wasted on placements that don’t contribute to business growth.
To make PMAX work in your favour, it’s essential to guide the algorithm away from these inefficiencies and towards smarter, more profitable ad placements.
How to Optimise PMAX for Better Results
One of the most effective ways to ensure PMAX isn’t skewing results by over-prioritising brand searches is to separate brand and non-brand traffic. PMAX has a habit of bidding aggressively on branded keywords, which makes performance look better on the surface but doesn’t actually increase new customer acquisition. To counter this, brand exclusions should be added to PMAX campaigns, ensuring that the budget is directed towards acquiring new users rather than reinforcing existing demand.
Regularly reviewing search term insights is crucial. Within the campaign insights report, checking what terms are triggering PMAX conversions provides valuable visibility into where budget is going. If a significant portion of clicks and conversions are coming from brand-related searches, adjustments need to be made to shift the focus towards non-branded search terms.
Another critical factor in PMAX success is optimising the product feed. Since PMAX relies heavily on product data rather than manual keyword targeting, structuring product titles correctly can significantly impact how ads perform. One of the simplest yet most effective strategies is to incorporate high-converting non-brand search terms into product titles, preferably near the beginning. This tactic increases relevance in Google’s algorithm, leading to better-matched queries and stronger conversion rates.
In addition to refining product feed data, using Search Themes within PMAX can further guide its automation. Search Themes act as signals that influence where PMAX chooses to place ads, providing some control over the campaign’s direction. While this doesn’t replace direct keyword targeting, it helps steer PMAX towards more relevant, high-intent searches. Selecting themes that align closely with core product categories and common customer pain points can help ensure better traffic quality.
Why PMAX Should Never Be Your Only Strategy
Despite its ability to automate ad placement across multiple Google networks, PMAX should never be relied on exclusively. A common mistake businesses make is assuming PMAX can handle all their paid advertising needs, but in reality, it works best when combined with other campaign types.
Standard Shopping campaigns, for example, offer greater control over search queries and bid adjustments, making them a valuable addition to any PMAX strategy. Running a mix of PMAX and Standard Shopping campaigns ensures that high-intent, non-brand search traffic is still being targeted effectively without the risk of automation overriding budget allocations.
Traditional Search campaigns also play an essential role in maintaining keyword-level control. While PMAX is excellent for broad discovery, Search campaigns allow businesses to specifically target the most valuable queries, ensuring that advertising spend is being directed towards the right audience segments.
Another strong supplementary tactic is running remarketing campaigns alongside PMAX. Since PMAX doesn’t allow full visibility into which placements are driving repeat engagement, setting up dedicated remarketing lists for returning visitors ensures that high-intent users receive follow-up ads tailored to their previous interactions.
Final Thoughts: Making PMAX Work for You
PMAX can be an incredibly effective tool, but only when used strategically. The key is to actively manage and optimise how it allocates budget rather than trusting automisation blindly. By excluding brand search, optimising product feeds, leveraging Search Themes, and supplementing PMAX with other campaign types, businesses can ensure that ad spend is directed towards new customer acquisition rather than wasted on existing demand.
PMAX works best as part of a larger Google Ads strategy, not as a standalone solution. Regular monitoring and adjustments ensure that automation remains aligned with business goals, profitability, and long-term growth. Rather than letting Google’s AI dictate where your ad spend goes, take control of PMAX and use it as a tool to scale smarter, not harder.
