Google rolled out its May 2026 core update on May 21. It is expected to finish around June 4. If your website traffic has fallen off a cliff in the past two weeks, this is probably why.
But before you start ripping pages down or rewriting headlines, you need to understand what a core update actually does, because the instinctive response is almost always the wrong one.
What a core update is
Several times a year, Google recalibrates how it scores content across its entire index. Not specific sites. Not specific pages. Everything, simultaneously.
Google uses a restaurant analogy. Imagine you wrote a list of your 20 favourite restaurants in 2019. New places have opened. Your tastes have changed. You rewrite the list. The restaurants that drop are not worse. You have just reassessed the field.
A core update is not a penalty for breaking the rules. That is what spam updates do. A core update is Google saying: we have re-evaluated what "good" looks like, and some content that used to rank well no longer meets the bar.
That distinction matters because it changes what you should do about it.
What Google is looking for
Google's own documentation, published on its Search Central site, lays out four areas its systems evaluate during a core update.
The first is content quality and originality. Does your content provide original information, reporting or analysis? Does it add something that did not exist before, or does it repackage what is already available elsewhere? Is it well produced, or does it look like it was assembled fast and without care?
The second is E-E-A-T: experience, expertise, authoritativeness and trustworthiness. Google wants to know who wrote the content, whether they have genuine knowledge of the subject, and whether the site publishing it is a credible source. Trust is the most important of the four signals. For topics that affect health, finances or safety, these signals carry even more weight.
The third is the distinction between people-first and search-engine-first content. Google explicitly asks whether content was created to help readers or to attract search traffic. Red flags include writing about trending topics you have no expertise in, producing content across dozens of topics hoping some will rank, using automation without adding value, and changing publication dates to make old content look fresh.
The fourth is page experience. Loading speed, visual stability, clean layout, absence of intrusive pop-ups. Sites that are slow, cluttered or frustrating to use are losing ground to cleaner alternatives.
What the data shows so far
The update is still rolling out, so final conclusions are premature. But early tracking data from Ahrefs, Semrush and independent tools shows 20% to 35% traffic drops for affected sites in the first week, with some sections losing more than 50%.
Affiliate pages and templated content have been hit hardest, with one agency reporting a 71% decline in visibility for those page types. A trend reversal was observed on May 29, with early winners giving back gains, which means the initial movements are not reliable indicators of final outcomes.
The pattern from the March 2026 update is continuing: Google is favouring original, authoritative sources over aggregators and publishers that repackage existing information. Brand reputation alone no longer protects established sites from demotion.
AI-generated content is not being penalised as a category. Generic, mass-produced AI content that adds nothing original is.
What to do
Do not make reactive changes while the update is still rolling out. Wait until at least a week after Google confirms completion on its Search Status Dashboard, then compare your post-update data against your pre-May 21 baseline.
If you see a sustained, large drop, audit the affected pages honestly. Does the content offer something a reader cannot find elsewhere? Is the author credible? Would you trust this page if you found it for the first time?
Do not delete content unless it is genuinely beyond improvement. Do not chase word counts. Do not change dates. Do not publish a burst of new content to make the site look active.
The changes that matter are the slow ones: improving depth, adding genuine expertise, making pages faster and cleaner, and writing for the person who lands on your site rather than the algorithm that sends them there.
Google has said some improvements take days to register. Others take months. Full recovery from a core update typically requires sustained work over three to six months and is usually confirmed during the next core update cycle, not between updates.
The bigger picture
Google is running core updates more frequently than ever. The May update landed six weeks after the March update, which landed six weeks after the December 2025 update. The message is consistent and getting louder: content that exists to rank rather than to help is being systematically demoted.
The companies and publishers that treat this as a one-off disruption will keep getting hit. The ones that build around genuine expertise and reader value will keep gaining ground.
Google is not hiding what it wants. It is published on its own website. The question is whether you are willing to do the work it describes.
