Search algorithm updates have become the single largest source of unplanned traffic swings for publishers. Google runs several major core updates a year, and each one can move a site's search visibility sharply in either direction. The March 2024 core update was severe enough that some publishers reported traffic declines of 70 to 90 percent, according to reporting by AdExchanger.
The mechanics matter more than the drama. Google has shifted from penalizing individual pages to downranking entire publishers when its systems flag what it considers spammy or unhelpful content anywhere on the site. That means a coupon directory or a pay-to-post sponsored section can drag down rankings for news articles that had no problem at all. This is the structural change publishers need to understand before they react to the next update.
This guide explains how core updates work, why traffic disappears the way it does, and what a publisher can actually do — including the uncomfortable answer that, during a rollout, the best move is often to do nothing.
What is a core update, and how often does Google run one?
A core update is a broad change to the ranking systems that decide which pages appear in Google Search results. Google describes them as regular updates meant to surface relevant, satisfying content from all types of sites. They are distinct from spam updates, which target specific abusive practices, and from narrower systems like the helpful content system, which assesses whether a page genuinely serves a searcher.
The cadence has accelerated. According to Digiday, Google conducted four core updates in 2024, four in 2023, two in 2022 and three in 2021 — and announced it would run them more often. The March 2025 core update ran from March 13 to March 27, a two-week rollout during which rankings can swing daily.
Core updates are also just the visible layer. Google's own disclosures, tracked in Search Engine Land's running timeline of algorithm updates, put the total number of search changes in the thousands per year — the company said it launched 4,725 changes to search in 2022, or roughly 13 per day. Most are invisible. A handful reshape entire business models.
Why does traffic disappear sitewide instead of page by page?
The old model was surgical. A page that violated guidelines lost its own rankings; the rest of the site carried on. An SEO consultant cited by AdExchanger described a systemic shift: Google now downrates sites at the publisher level rather than the URL level when it spots unhelpful content or spam.
The consequence is that monetization sections carry ranking risk for the whole domain. A digital media site with a coupon directory or sponsored content that exists mainly to monetize — not to serve searchers — can see declines across its entire site. AdExchanger pointed to Forbes, which was reported to have operated a subdomain used for what the report called shady monetization tactics, as the kind of practice this structure targets.
There is an honest complication here. The publisher consultant in the same report noted that Google spent years signaling, through its own best practices and its traffic patterns, that coupon directories and aggregated, metadata-heavy content were what the algorithm rewarded. Strategies that followed the signals of one era became liabilities in the next. Publishers who built to the old spec were not behaving badly by the standards they were given. The standards changed underneath them. This connects to our earlier piece, Reddit became a top traffic source for publishers — here's how to treat it honestly.
Who wins and who loses when an update lands?
The pattern in recent updates is uncomfortable for small and specialty publishers. HouseFresh, an independent product reviews site, said its search traffic fell 90 percent after the March/April 2024 core update, with the traffic flowing largely to large publishers such as Dotdash Meredith — sites that, in HouseFresh's view, often aggregate reviews from niche publications and produce content at scale to monetize affiliate traffic. That is the opposite of what a helpful-content framework would seem to reward, and HouseFresh said so publicly. For related coverage, see The 2024 Gmail and Yahoo sender rules, two years on: what publishers changed and what still bites.
It is not only media companies. Tuta Mail, an encrypted email service in Europe, reported a 90 percent traffic decline after the same update. Its CEO, Matthias Pfau, told Reuters that Google had obviously changed something but would not say what or why. His company received what he described as radio silence from Google.
One case is evidence of one case, and the sites that lost traffic and folded do not publish retrospectives — survivorship cuts both ways. But the direction of the pattern repeats across the documented examples: niche sites down, large aggregators up, and no explanation from the ranking system itself. The winners, the AdExchanger consultant suggested, look less like the most helpful sites and more like the largest platforms.
What can a publisher actually do after a hit?
Less than instinct suggests. The documented guidance from operators and consultants converges on restraint:
- Wait for the rollout to finish. A publishing executive told Digiday that acting mid-update is pointless: any change made during a rollout has no effect before it ends, and it muddies the analysis of what actually happened. Traffic can bounce back on the last day after a dip, or drop after a spike.
- Expect a lag before the picture is clear. The real impact may not be legible until days or weeks after the update completes. Google sometimes rolls out an update, watches it settle, and then adjusts it.
- Resist the quick-fix instinct. SEO consultant Jason Hennessey told Digiday there is no fast recovery. People go into panic mode looking for one; it does not exist. Fixes at large sites take months by nature.
- Audit the whole domain, not the hurt pages. Because downranking now operates at the site level, the honest question is whether any section — a coupon directory, a pay-to-post area, a scaled content play — reads as spam to Google's systems, and whether it is worth the sitewide risk.
- Rebalance the traffic portfolio. Search is one channel among several. Publishers who treat email, push, and community referrals as primary rather than backup carry less single-point-of-failure risk into every update cycle.
What this means in practice: the controllable work is structural, and it happens between updates, not during them. Follow published best practices, keep monetization sections clearly separated from editorial content, and accept that Google's stated feedback to publishers is to fix their own sites and expect improvement organically by the next core update.
Is search still worth the dependence?
The honest assessment is that search remains a large referral channel with rising variance and falling transparency. Google has layered AI-generated results on top of the core ranking systems, and publishers still know little about how that feature affects their referrals, as Digiday noted nearly a year after its launch. Each core update is a reminder that the terms of the relationship can change without notice, and that the affected party has no appeal process that works on a business timeline.
The durable conclusion is not that publishers should abandon search. It is that search algorithm updates have converted a stable channel into a volatile one, and volatility is a portfolio problem. The publishers best positioned for the next update are the ones whose economics do not require any single update to go well. The evidence so far supports building that way. What remains unknown is whether Google's pace of change slows or the concentration of winners intensifies — and nothing in the company's public communications suggests an answer is coming.
