Last updated: April 2026
Performance Max promised simplicity. Hand Google your budget, your assets, your goals — and let the machine figure out the rest.
For a while, that was enough. But as PMax has matured, the gap between advertisers who treat it as a black box and those who actively steer it has become impossible to ignore.
The good news: Google has shipped more transparency and control features in the past six months than in the previous two years combined. The bad news: most advertisers have not activated them yet.
This guide covers the seven strategies that are making the biggest difference for Coby Agency clients right now — updated for the features that are live in April 2026.
What Has Changed in Performance Max Since Late 2025
Before getting into the strategies, it helps to know what you are now actually working with.
Google launched a channel performance timeline view in early April 2026, giving advertisers a visual graph showing how each channel — Search, YouTube, Display, Discover, Gmail, and Maps — contributed to campaign performance over a selected time period. Instead of a single blended ROAS number, you can now see which channels are driving results and which are consuming budget without converting.
First-party audience exclusions are also now live, letting you exclude specific customer lists from your Performance Max campaigns — so you can stop serving ads to people who converted last week and focus spend on new customer acquisition.
PMax Experiments allow you to test a control setting against another campaign type, or measure the uplift of including Performance Max alongside other campaign types, so you can make evidence-based decisions about where it belongs in your account.
These three features alone change how PMax should be managed. Here is how to use them.
Coby’s 7-Step Performance Max Control Framework
1. Use the Channel Timeline Before Touching Anything Else
The channel performance timeline is the starting point for every PMax audit. Before adjusting bids, budgets, or assets, pull the timeline for the last 30 days and look at where your conversions are actually coming from.
If you are running product feeds through Performance Max, the timeline shows how product list ads perform across each channel. Shopping campaigns historically dominated PMax spend allocation, but you could not tell how much YouTube or Display was cannibalising your Shopping budget. Now you can see exactly where spend is going.
For B2B lead generation, correlate channel performance with lead quality data from your CRM. If Search drives qualified leads while Display generates form fills that never convert, the timeline gives you the data to act on that.
2. Enforce Campaign-Level Negative Keyword Lists
This was the most requested feature in PMax history. Advertisers now have more controls over who sees their ads and where, with negative keywords, brand exclusions, URL controls, device and demographic controls, and placement exclusions.
Use negative keyword lists to block brand terms (if you have a separate brand campaign), competitor names, and irrelevant intent signals. A SaaS company should not be appearing for searches like “Performance Max tutorial” unless that is genuinely their audience. Build your exclusion list from Search Terms data in your other campaigns and apply it at campaign level from day one.
3. Activate First-Party Audience Exclusions Strategically
The new “Your data exclusions” option in campaign settings allows you to exclude customer match and remarketing audiences from Performance Max.
The most effective use case: exclude recent converters (last 30 to 90 days depending on your sales cycle) so Google stops serving acquisition-focused ads to people who are already customers. This sharpens your new customer acquisition goals and stops wasting budget on audiences already in your pipeline.
One important note: be careful, as the need to exclude audiences varies by advertiser. What works for one may not apply to another. Test with a 14-day window before committing to longer exclusion periods.
4. Run a PMax Experiment Before Making Major Changes
Most advertisers make changes to Performance Max campaigns based on instinct. PMax Experiments let you test instead.
You can test a Performance Max campaign against an existing Shopping or Search campaign via a 50/50 traffic split, or test the Uplift of including Performance Max alongside other campaign types. The Uplift experiment is particularly useful: it shows the incremental gains of running PMax alongside your existing Search campaigns, rather than assuming they cannibalise each other.
Before restructuring your account around PMax, run a 3 to 4 week Uplift experiment. The data will tell you whether PMax is adding reach or just duplicating conversions you would have captured anyway.
5. Set Brand Guidelines to Control AI-Generated Assets
Google Ads Editor 2.12, released in March 2026, now supports brand guidelines, allowing you to specify up to 25 term exclusions and 40 messaging restrictions per campaign for Search and Performance Max.
This matters because Final URL Expansion and automated asset generation can produce copy that is off-brand, off-strategy, or legally problematic. Use term exclusions to block phrases your legal team or brand team have flagged. Use messaging restrictions to define what your ads can and cannot say about pricing, guarantees, or product claims.
6. Expand Video Assets to Use the New 15-Video Limit
The limit for videos has been increased to up to 15 videos per asset group in Performance Max campaigns. Most advertisers are running one or two videos because that was the historical limit. Google’s AI needs variety to find what resonates across YouTube Shorts, YouTube in-stream, and Display.
Even if you do not have a video production budget, Veo video generation in Asset Studio — Google’s advanced video model — now helps create video assets for YouTube placements within PMax. Short 6 to 15 second videos created from static assets are enough to populate the additional slots and unlock inventory you are currently missing.
7. Build a Weekly Review Rhythm Around the New Reporting
More data is only useful if you actually look at it. The channel timeline, placement reports, and asset performance data are available now, but they require a structured review process to translate into action.
Coby’s recommended weekly PMax review covers four things: channel performance changes week over week, new placements to exclude, asset rotation signals (which headlines and images are losing impressions), and experiment results if one is running. This takes 20 minutes per campaign and prevents the drift that causes PMax performance to plateau after the initial learning period.
The Bigger Picture: PMax in 2026
The biggest mistake is thinking that new AI-powered features can compensate for weak fundamentals. Automation works best when tracking, pages, structure, creative, and business feedback loops are already strong.
Performance Max is not a replacement for strategy. It is a distribution layer that amplifies whatever inputs you give it. Strong conversion tracking, clear audience signals, and well-structured landing pages will always outperform a PMax campaign left to run without direction.
The 2026 updates give you more levers to pull. Whether you pull them thoughtfully or leave them untouched is the difference between PMax working for you and working against you.
Frequently Asked Questions
Should I use Performance Max or standard Search and Shopping campaigns in 2026?
Use both in complementary roles. Standard Search and Shopping give you precise control and full keyword transparency. Performance Max adds reach across YouTube, Display, and Discover. The combination consistently outperforms either approach alone, provided your tracking is clean enough to measure the difference.
How many asset groups should a Performance Max campaign have?
Start with one asset group per distinct audience or product category. If you sell to both SMEs and enterprise clients, separate asset groups let you tailor creative and landing pages to each. More than four or five asset groups in a single campaign usually indicates you should be running separate campaigns instead.
What is the fastest way to reduce wasted spend in Performance Max?
Apply campaign-level negative keyword lists and exclude recent converters via the first-party audience exclusion feature. These two changes address the most common sources of wasted spend: irrelevant search intent and budget spent re-engaging people already in your pipeline.
How long does Performance Max take to exit the learning period?
Typically 2 to 4 weeks, depending on conversion volume. Google recommends at least 50 conversions in the first 30 days for Smart Bidding to optimise reliably. If you are below that threshold, use a Maximise Conversions bid strategy without a target ROAS until volume is established.
Does Performance Max cannibalise existing Search campaigns?
Sometimes, but not always. Run a PMax Uplift experiment to measure the actual incremental impact in your account before assuming cannibalisation. In most accounts with strong Search campaigns, PMax adds reach rather than stealing credit — but the experiment data will confirm this for your specific setup.