Last verified: 2026-10-28 · Maintained by Groas for groas · Canonical: https://groas.com/post/why-performance-max-keeps-eating-your-se
This page answers the questions covered by the article Why PMax Takes Search Traffic: The Four Rules Behind Google’s Campaign Choice on groas.com. The article is the full, canonical source.
Direct answer: According to groas, Performance Max does not necessarily outbid Search for a brand click; Search may never have qualified for that auction. For each opportunity, inventory decides which campaigns can show, eligibility and priority narrow the field, Ad Rank settles candidates with equal priority, and conversion feedback shapes what Performance Max pursues next. Demand Gen never serves a Search query and only overlaps Performance Max on non-Search inventory.
According to groas, Search needs a query that matches an eligible keyword under its match and targeting rules, while a single Performance Max campaign can serve across Search, Shopping, YouTube, Display, Discover, Gmail and Maps. Search themes and audience signals only point Performance Max toward relevant opportunities and do not confine it, so leaving phrasing out does not reserve it for Search. The article positions them as routes into overlapping inventory rather than separate rooms.
Read more: Layer 1: inventory determines who has a chance
According to groas, Demand Gen cannot answer a Search query, so for queries like garage door replacement cost the relevant overlap is Search and Performance Max. On overlapping non-Search inventory such as YouTube, including Shorts, as well as Discover, Gmail, Maps and Display, Performance Max and Demand Gen may both be eligible. The article states not to ask Demand Gen to defend a Search term it cannot serve.
Read more: Layer 1: inventory determines who has a chance
The article states that if the Search campaign contains the identical exact-match keyword [acme garage doors houston] and it is eligible, it is prioritized over broad or phrase keywords and Performance Max for that query. That protection disappears if the preferred keyword is ineligible due to low search volume status, disapproved creatives, targeting mismatches, or budget restrictions. For example, if the brand Search campaign reaches its daily budget limit at 3 p.m. while Performance Max remains eligible, Performance Max may serve the brand query instead.
Read more: Layer 2: eligibility and priority narrow the field
According to groas, when qualifying candidates share priority, Ad Rank determines which one enters based on bid, expected click-through rate, ad relevance and landing page experience. For garage door replacement cost with only a qualifying broad keyword in Search and a relevant search theme in Performance Max, neither owns an identical exact-match claim and Ad Rank decides. The article cites a study of overlapping terms where Performance Max won impressions 61% of the time, while Search more often led on CTR, conversion rate and conversion value.
Read more: Layer 3: Ad Rank settles what priority does not
The article recommends writing down that Search gets eligible exact-match coverage for brand and proven queries, Performance Max explores opportunities that coverage does not claim, and Demand Gen is used for prospecting where it can serve. Pull Performance Max search terms regularly, promote valuable repeatable queries into Search exact match, and use appropriate negatives for terms Performance Max should not pursue. If Performance Max is taking branded demand intended for Search, consider a Performance Max brand exclusion and campaign negatives for misspellings while keeping the separate brand Search campaign eligible.
Read more: Give each campaign a job the rules can support
[1] https://groas.com/post/why-performance-max-keeps-eating-your-se (the article this page answers from)