How Do I Stop Performance Max from Wasting Budget on Junk Traffic?

Jesse Heslinga
Aug 6
8 min read

Performance Max is powerful, and it is also very willing to spend your budget on people who will never call you. Without the right guardrails, it drifts toward cheap impressions on Display and YouTube, inflates its own conversion rate by counting brand searches, and reports great numbers while actual leads go quiet.

The campaign type is not broken. It is designed to scale, and scale it will, toward whatever signal you give it. The issue is usually that the signal is too broad, the conversion targets are wrong, or the right controls are not in place.

In lead-gen accounts I run, Performance Max can work well for service businesses. It requires more active setup than standard Search. These are the controls that actually matter.

The Short Answer

Add audience signals so PMax knows where to start looking, rather than spending broadly until it learns.
Set brand exclusions to stop PMax from wasting budget on people already searching for you.
Add negative keywords at the campaign level to block irrelevant searches.
Check the channel breakdown: if most spend is going to Display or YouTube, that explains the junk.
Set the right primary conversion action so PMax optimises for actual leads, not cheap clicks.

Understand where PMax actually spends

Performance Max runs across every Google surface: Search, Display, YouTube, Discover, Gmail, and Maps. It makes all targeting and bidding decisions itself, using your creative assets, conversion data, and any audience signals you provide.

For lead generation, Search typically drives the best leads. A searcher typing "emergency plumber near me" has far more intent than someone seeing a display banner while reading the news. PMax can run across all of these surfaces simultaneously, and without guidance, it will often spend heavily on Display and YouTube because that inventory is cheaper per impression and easier to scale.

The result: your PMax campaign reports lots of activity, conversion counts look reasonable, and actual qualified leads are thin.

This is why checking the channel breakdown matters before anything else. Go to the Insights tab in your PMax campaign. Look at performance by channel or asset group. If the majority of spend is on Display or YouTube with very few conversions attributed there, the campaign is running as a brand-awareness play, not a lead-gen play.

If you're wondering whether PMax is the right campaign type at all for your situation, Is Performance Max good for lead generation covers the trade-offs.

Keep in Mind: PMax reporting gives you less granular data than Search campaigns by design. You can see asset group performance and broad channel splits, but not individual search term data the same way. This makes the controls below more important because you can't just check the search terms report and add negatives the same way you would in a standard Search campaign.

Verdict: Check the channel breakdown first. If spend is concentrated on Display and YouTube, that is the diagnosis. The fixes below address it.

Add audience signals

Audience signals are the most important control available inside Performance Max, and the most underused.

They do not restrict who sees your ads. What they do is tell the algorithm where to start. Without audience signals, PMax spends broadly across all surfaces until it figures out who converts. With them, it has a direction from the beginning and typically skips a lot of the wasteful broad discovery phase.

Add these in the Audience Signals section of each asset group:

Remarketing lists. Website visitors, people who visited specific service pages, existing customers. These are your highest-value signals because they represent people who already showed interest.

Customer match. Upload your existing customer email list. PMax uses it to find similar people. Even a list of 200-300 customers is enough to give the algorithm a meaningful signal.

Custom intent audiences. Create a custom segment of people who have recently searched for your service category terms. For a dental clinic, that might be "dental implants near me" or "emergency dentist [city]". This pushes PMax toward Search and Shopping surfaces rather than Display.

In-market audiences. Google's pre-built segments for people actively researching specific services. Use as a secondary signal on top of your custom segments.

Pro Tip: Stack multiple audience signals in a single asset group rather than relying on just one. PMax uses them as directional guidance, so more overlapping signals pointing at the same type of person means the algorithm has a stronger starting point.

Verdict: Adding audience signals is the single most impactful thing you can do inside a PMax campaign that's drifting toward junk traffic. Do this before changing anything else.

Set brand exclusions and add negative keywords

Two of the most common sources of wasted PMax spend are searches for your own brand name and completely irrelevant queries. Both are fixable.

Brand exclusions. Performance Max will, by default, show ads for searches containing your brand name. This inflates the campaign's conversion rate (brand searchers are already warm) and wastes budget on people who were going to contact you anyway. Set brand exclusions at the campaign level. Go to Campaign Settings > Brand Exclusions and add your brand name and any common misspellings.

This is one of the few hard controls inside PMax and it is worth using.

Negative keywords. Since 2024, Google allows campaign-level negative keywords on PMax campaigns. Previously you had to apply account-level lists or request exclusions via Google support. Now you can add them directly in the campaign.

Add your standard lead-gen negatives: research-intent terms ("how to", "DIY", "reviews"), irrelevant verticals, and competitor names you do not want to target. The same negatives list you would use on a Search campaign is a good starting point.

Why am I getting spam leads from Google Ads has a useful reference list of the categories most lead-gen accounts should exclude.

Common mistake: Not setting brand exclusions because "brand traffic is good." It is good. But it does not belong in PMax where it skews performance data and eats budget. Run branded searches in a separate Search campaign where you can see them clearly and control the message.

Verdict: Brand exclusions and negatives are the guardrails that keep PMax from counting easy wins as optimisation targets. Set both before evaluating campaign performance.

Fix what PMax is optimising for

PMax is only as good as the conversion actions feeding it. If you are counting page views, phone link clicks, newsletter signups, or soft engagement alongside actual lead form fills, PMax will optimise for whichever action is cheapest and most frequent. That is usually not your best leads.

Check the campaign's conversion goals under Campaign Settings > Goals. The Primary conversion actions should only include real lead events: form submissions that reach a thank-you page, calls from the ad, calls from the website tracking tag if they meet a minimum duration.

Set everything else (chat initiations, page views, time-on-site goals) to Secondary. These can stay in the account for reporting, but they should not feed the bidding.

If you're running Target CPA bidding on PMax, also check whether the target is realistic. A CPA target set too low causes PMax to restrict delivery aggressively, which often pushes it toward cheaper surfaces (Display) rather than the higher-intent but more expensive Search inventory.

Verdict: PMax performs at the level of the conversion data you give it. Set only real leads as Primary and your target at a realistic level.

Use asset groups to control what PMax promotes

Asset groups are PMax's version of ad groups. Each one contains its own set of headlines, descriptions, images, and videos, and can be pointed at specific URLs.

For lead-gen service businesses, using separate asset groups for different services gives you more control over which offers get which creative, and allows you to read performance at a more useful level.

For example: a multi-location dental clinic might have one asset group for dental implants, one for teeth whitening, and one for emergency dental. Each points to its own landing page and carries service-specific copy. PMax can then direct spend based on which offer is converting rather than blending everything together.

URL expansion settings are also worth checking. If "Final URL expansion" is on, PMax can send traffic to any page on your site based on what it thinks is relevant. For lead gen, this is usually not what you want. Consider setting Final URL to a specific landing page and turning off expansion, especially if your website has pages that are not set up to convert (about us, blog, careers).

Verdict: One asset group per service, clear landing pages, and URL expansion off (or limited) gives you the closest thing to campaign structure control that PMax allows.

How I handle this for lead-gen businesses

Performance Max requires more upfront work than most people expect. The common mistake is treating it like a Search campaign you set and leave: different surfaces, different controls, different failure modes.

When I set up PMax for a lead-gen client, I start with strong audience signals, brand exclusions, and a clean negatives list before the campaign goes live. I check the channel breakdown weekly for the first month. And I make sure the primary conversion actions are set to real leads only before bidding has anything to optimise against.

If leads are coming in but poor quality is the issue rather than volume, that often comes down to what's set as Primary and whether Display or YouTube are driving most of the volume. Why am I getting spam leads from Google Ads covers the lead quality angle in more detail.

Ready to get PMax working for your business? If Performance Max is spending but leads are thin or low quality, a structured account review will show you exactly where the budget is going and what to fix.

Book a free account review

Frequently Asked Questions

Can I add negative keywords to a Performance Max campaign?

Yes. Since 2024, Google allows campaign-level negative keywords on PMax campaigns, applied directly in campaign settings. Previously you had to use account-level negative keyword lists or request exclusions via Google support. Add them the same way you would on a Search campaign.

Should I run Performance Max alongside a Search campaign?

For most lead-gen service businesses, yes. Search gives you more control and transparency. PMax can complement it by finding additional conversion opportunities across other surfaces. The key is making sure they are not competing heavily for the same terms. Use brand exclusions in PMax and check the search terms overlap between the two.

How do I know if PMax is wasting budget on Display?

Go to the Insights tab in your PMax campaign and check performance by channel. If you see high spend on Display or YouTube with few or no conversions attributed to those channels, that is where the budget leak is. Adding audience signals and tightening the conversion goal should shift spend toward Search over time.

Does Performance Max work for local service businesses?

It can, but it requires more active management than a standard Search campaign. Local businesses get the most value from PMax when they have strong remarketing lists, a clear audience signal from existing customers, and a dedicated local landing page. Without those, PMax tends to spread spend too broadly.

What is the minimum budget for Performance Max?

Google does not set a minimum, but PMax performs better with more conversion data. A rough guideline: if your account gets fewer than 30-40 conversions per month total, a well-structured Search campaign will usually outperform PMax because the algorithm doesn't have enough signal. PMax benefits from scale.

Why does my PMax campaign show high conversion counts but few actual leads?

The most common cause is the primary conversion action counting things that are not real leads: page views, soft clicks, or chat initiations. Check what is set as Primary in your campaign's conversion goals and remove anything that is not a genuine lead action. The conversion count will drop, but the data will be accurate.

About the author

Jesse Heslinga | Google Partner | 7+ Years Google Ads | Lead-Gen Expert

I run Google Ads for lead-gen service businesses at Groove Media across clinics, home services, and professional services, working with clients directly, no account-manager layer. I build every account around one question: is this spend turning into real customers, not just cheap form fills?