2. Segment your campaign with feed attributes
Accurate segmentation is crucial for running successful PMax campaigns on Google. The Product Type and Google Product Category are highly relevant in search results, so it's important to be specific and precise when assigning them.
After assigning product types to your items, you can create product groups based on this attribute.
Or you can create custom labels based on the criteria of your choosing and gain even more flexibility in product segmentation. You can select the products that will be included in a particular asset group in your PMax campaign.
Product type optimization
You can increase the precision of PMax targeting by properly segmenting products into product types. Within PMax asset groups, you can target specific audiences based on their interests and lists of people who have visited stores.
You can also filter the products you want to use for asset groups in your PMax campaign. You can create separate asset groups for very specific categories of products, such as gloves or sunglasses. The more specific the product_type you identify, the better.

Creating asset groups | Google Ads
If you already have product types assigned to specific products in your feed, you can easily map them using a feed tool.

Mapping product types | DataFeedWatch
If not, you can extract product-type from product descriptions or titles
Mapping product types | DataFeedWatch
Or you can assign values based on key phrases:

Mapping product types | DataFeedWatch
Creating custom labels
Although custom labels may not directly enhance your ad performance, they can be useful in managing your products. Custom labels can help you organize your products into different categories or campaigns, and track their performance based on factors such as tROAS (target return on ad spend), seasonality, or overall distribution. This can provide a clearer overview of your product data and aid in maintenance.
If you have margin information available, you can create custom labels with ranges of either absolute gross margin levels or as a percentage of revenue. This allows you to split PMax campaigns into different CPA targets (if absolute) or ROAS targets (if ratio), depending on profitability.

You can also distribute products accurately across campaigns, segmenting them based on product performance data or discounted products.
According to Feed Marketing Report 2022, the most popular product information used by marketers to create custom labels are the following:

Feed Marketing Report 2022 | DataFeedWatch
3. Exclude unprofitable products
You can significantly improve your ROI from the PMax campaign by removing products that are unprofitable or underperforming.
Low-priced products, for example, below $5.00, have possibly low margins, and it's often not profitable to sell them online (unless purchased in large quantities).

Excluding products | DataFeedWatch
It’s also advisable to exclude underperforming products that have a bad impact on the overall result of your PMax campaign. You can identify underperforming products using key metrics: Clicks, Conversions, ROAS, or other metrics of your choice. It doesn’t take a lot of time, and you should spend 5 minutes on it every week, and then you can exclude those products with one click.
With the DataFeeWatch tool, it is also possible to exclude all product variants if any of them or a certain percentage of all variants go out of stock. It will increase your conversion rate.
This functionality comes in handy when you have observed that a particular variant is the most popular, and, if it’s unavailable, you start getting lots of irrelevant clicks. Then you can stop serving ads for this product until your stock is replenished.

Excluding products | DataFeedWatch
Other feed tactics boosting your PMax performance
In addition to the 3 main data feed hacks discussed in the previous sections, there are several other useful tactics that can help optimize your data feed and improve the effectiveness of your Performance Max campaigns.
4. Run tests on images (and titles) using custom UTM parameters
While not widely known, it's worth considering the tactic of A/B testing your product images using custom UTM parameters for image URLs.
By doing this, you can track the performance of each image in Google Analytics and determine which URLs are most successful in drawing visitors to your ads. This is a useful method for A/B testing images, and can also be applied to test different product titles.
5. Add extra feed attributes to your PMax feed
Adding all mandatory attributes to your Performance Max campaign is a must, otherwise, your products will be rejected. However, there are some additional, and non-mandatory attributes you can add that can significantly improve your feed.
Consider adding some attributes that you maybe don’t usually use but can potentially be to your PMax campaign’s benefit.
These are 2 examples of additional attributes enriching your product feed:
- Product details
The product_detail attribute is an attribute you can use to provide even more relevant information about your product in your data feed. In this way, you can inform potential customers about technical specifications or additional details about the items you sell. The product_detail attribute allows you to describe any aspect of your product that is not covered by other attributes you already use.
- Product highlights
Product highlights can also be used to share additional product details that may be of interest to your potential customers but are not mentioned elsewhere. For example: "Batteries not included." Product highlights are short bulleted lists of the most relevant information (highlights) about your products for shoppers. These should be short and easy-to-consume chunks of text.

6. Use performance data and other external data to enrich your PMax feeds
The data that are really valuable and that can really help you to optimize your Performance Max campaigns are performance data. These data are, of course, external, so you need to get them first from whatever monitoring tools you’re using (e.g. Google Ads Data Hub). Then you can use your performance data to fill custom labels and segment your campaigns (for example, to allocate the budget better). Integrate with a Google Shopping automation tool to do it in-bulk.
You can also consider a bit of experimenting, such as mixing different external data, adding new dynamic variables, or changing the titles based on new information.
Practical examples:
- warehouse info (eg. prioritize campaigns with products that have lots of stock left)
- past performance data (group bestsellers and low-sellers together)
- or other
To upload external data into a feed, you can make use of the lookup table feature. This allows you to substitute old values with new ones. To do this, you simply need to insert the link to your Google Sheet or use a comma separated CSV (local Drive). Your file needs to have two columns, one with the current values from your shop and another with the new values. It's important to ensure that your file only has one sheet.

7. Add high-quality images
It is important that the images you include in your PMax feed are of high quality and match the overall style of your company. Google will use them in your Shopping campaigns.
Having a low-quality image of your product can have a negative impact on its sales by deterring potential buyers. Even though Google has a minimum image size requirement of 100x100 pixels (250x250 for clothing & apparel), bigger and higher-quality images tend to perform better. Larger images are more visually attractive and can more accurately showcase the product's features and benefits compared to smaller images.

In a test conducted on a random group of people, 82% of them stated that they would be more inclined to click on a Shopping ad if the image displayed someone wearing the product, rather than just the product itself.
8. Use Merchant Promotions in Performance Max campaigns
You may want to consider creating a separate feed specifically for your promotions. This way, your special offer will be prominently displayed at the top of your ad. You can describe the promotion with wording such as "Sale" or "30% off," and highlight additional benefits like "Free shipping" within the promotion section to generate more clicks.

9. Acquire Product Ratings
By default, Google Shopping ratings are not shown in a shopping ad. You need to take steps to obtain approval from Google in order to display them.
The stars that usually appear at the bottom of a shopping ad are actually Google ratings. These ratings range from 1 to 5 and give potential buyers a general idea of the product's quality based on the ratings of other users. Seeing highly rated products gives users a positive experience. Good ratings have been shown to significantly improve click-through rates (CTR) and increase the likelihood of making a purchase.

Conclusion
In conclusion, optimizing your data feed is a crucial component of running successful PMax campaigns. By implementing the nine data feed hacks outlined in this article, you can improve your campaign's performance significantly. From focusing on high-quality images, improving product titles, and utilizing custom labels to enriching your feed with additional attributes, each of these hacks can have a significant impact on the success of your campaign.





