Run Search first. For most small businesses spending $500–$10,000 a month, a tight Search campaign buys the cheapest, highest-intent clicks you can get. Performance Max is worth adding once you have steady conversion tracking, brand exclusions set and enough budget that one campaign can learn without starving the other.
What is the actual difference between Performance Max and Search?
Search sells to people typing a problem; Performance Max sells to people Google thinks are about to have one.
Google’s own Ads Help documentation describes Performance Max as "a campaign type that allows advertisers to access all of their Google Ads inventory from a single campaign," powered by AI. You hand over assets, a conversion goal and audience signals, and one campaign runs across Search, Shopping, YouTube, Display, Discover, Gmail and Maps.
A Search campaign is narrower and more literal. You choose keywords, you see the search terms, you add negatives, and nothing serves on YouTube because you never asked it to. For an appliance repair shop, that narrowness is the point: someone typing "fridge repair Burnaby" is worth more than someone who watched a kitchen video.
| Search campaign | Performance Max | |
|---|---|---|
| Where ads show | Search results, plus search partners if enabled | All Google Ads inventory from one campaign |
| Targeting | Keywords and match types you choose | Keywordless prediction, plus search themes |
| What you can see | Search terms report, keyword-level data | Asset group and search terms insights |
| Query control | Negative keywords | Campaign-level brand exclusions |
| Sensible budget | A few hundred dollars a month in one city | Enough daily spend across six channels to learn |
| Best first use | Capturing existing demand | Scaling demand already captured |
Which campaign serves when both could show my ad?
An exact-matching Search keyword wins; otherwise the campaign with the higher Ad Rank serves.
This is written down, and it is the single most useful rule to know before you run both. Google’s Ads Help page on how Performance Max interacts with other campaigns says that when several of your campaigns could serve the same impression, the one with the highest Ad Rank is prioritised — which is how Google stops your own campaigns bidding each other’s costs up. The exception is Search: a keyword that exactly matches the query, or matches it after spell correction, "will be preferred over Performance Max."
The gap is wider than it looks. Google’s own example is the misspelling "plumbrs" — an exact match keyword [plumbers] does not catch it, so Performance Max can. If no keyword in your account exactly matches what the person typed, Ad Rank decides, and Performance Max is often the one that shows. So the practical answer to "will Performance Max steal my Search traffic" is: not on the queries you have explicitly built keywords for, and quite possibly on everything else.
Should a small business start with Performance Max?
Usually not. Start with Search, then add Performance Max when you have something for it to learn from.
Performance Max is an optimisation engine, and an engine needs fuel — conversions. If your account sends Google thirty leads a month across six channels, you are asking a prediction system to find patterns in almost no data, across inventory you cannot inspect. Google itself recommends judging these campaigns on overall account goals rather than channel-level CPA or ROAS — reasonable advice, and a reminder of how little channel detail you get.
Google’s Ads Help documentation claims advertisers using Performance Max see an average of 18% more conversions at a similar cost per action. That is Google’s number about Google’s product, across advertisers far larger than a three-van plumbing company. Treat it as directional.
Our own results point the same way. A GTA mortgage brokerage we manage ran at 1,113 leads a month at $7.69 per lead in August 2026 — built on tightly structured Search, intent captured first. Reviewing how a budget is split is where our Google Ads management work starts.
How do I stop Performance Max eating my brand traffic?
Use campaign-level brand exclusions, not negative keywords.
This is the mistake that makes Performance Max look brilliant while your account stays flat. People searching your business name were going to find you anyway; if Performance Max serves there, it books the conversion and your cost per acquisition flatters itself.
Google Ads Help is explicit that brand exclusions are available for Search and Performance Max, apply to Search and Shopping inventory in Performance Max, and are "a better option for blocking brand traffic" than negative keywords — because they also catch misspellings and foreign-script versions of a brand name. Brand lists are built at account level and applied per campaign.
Search themes are the other lever worth knowing. Google describes them as "additive to the queries and placements Performance Max predicts will perform well" — a hint, not a keyword. Search terms insights shows a Source column telling you which queries came from your themes rather than Google’s prediction.
How do I know Performance Max is adding sales, not just claiming them?
Properly, you measure incrementality — but the tooling for that is still priced for larger advertisers.
On 7 October 2026, Search Engine Land reported that Google opened user-based Conversion Lift to Search and Performance Max on a self-serve basis, where it previously needed a Google representative. It withholds ads from a holdout group and compares it with people who saw them, estimating incremental conversions rather than trusting an attribution model.
The catch is eligibility. Per that report, advertisers need at least 1,000 observed conversions and participating campaigns need a minimum budget of $5,000, with availability varying by account. If you are spending $1,500 a month, that door is closed for now.
The crude substitute still works: make total new enquiries, not platform-reported conversions, your scoreboard. Note the launch week, keep brand exclusions on, and compare leads against spend month over month. If reported conversions jump and your phone does not, you have found cannibalisation.
What to do this week
- Check your conversion tracking fires on the action that makes you money — a form submission or a call over 60 seconds, not a page view. Everything below is worthless without it.
- If you already run Performance Max, open account-level brand settings and confirm a brand exclusion list is applied. If reported CPA looks suspiciously low, start here.
- Pull your Search campaign’s search terms report for the last 30 days and add exact match keywords for the queries that converted. Those queries then outrank Performance Max by the rule above.
- Spending under roughly $2,000 a month? Put it all into one well-structured Search campaign for 60 days before adding a second campaign type.
Frequently asked questions
Can I run Performance Max and Search campaigns at the same time?
Yes, and in most mature accounts you should — they are not alternatives. Google’s documentation sets the serving rules so the two coexist: an exact-matching Search keyword is preferred over Performance Max, and otherwise the higher Ad Rank campaign serves. The real risk is budget — two campaign types splitting a small one means neither gathers enough data to optimise.
What is the minimum budget for Performance Max?
Google publishes no official minimum, and anyone quoting a precise figure is guessing. The practical test is whether your daily budget generates enough conversions across six channels for the system to learn. For a single-city service business that usually means a few thousand dollars a month, which is why we send owners spending less into Search first.
Does Performance Max cannibalise my branded searches?
It can, and by default nothing stops it. Performance Max serves across all Google inventory including Search, so queries containing your business name are fair game unless you exclude them. Google’s guidance is that campaign-level brand exclusions block that traffic more reliably than negative keywords. Apply them before judging the campaign’s cost per lead.
Why does my Performance Max cost per lead look better than Search?
Three usual reasons: unexcluded brand traffic counted as new demand, cheap remarketing inventory flattering the average, and a blended figure hiding the expensive parts — which is why Google advises judging the campaign on overall goals rather than channel-level averages. Compare total enquiries against total spend before you shift budget.
Not sure your split is right? Book a free 48-hour audit and we will tell you.
Sources: Google Ads Help — About Performance Max campaigns; Google Ads Help — How Performance Max interacts with other campaigns in your account; Google Ads Help — Answering your top questions about Performance Max; Google Ads Help — About brand settings for Search and Performance Max; Search Engine Land, 7 October 2026 — Google opens Conversion Lift to Search and Performance Max.