Google has offered fresh insight into how its core updates are deployed—clarifying a long-standing question in the SEO community: do these updates roll out all at once, or in phases?
According to Google’s Search Advocate John Mueller, the answer is more nuanced than many expect.
Why Core Update Volatility Happens
SEO professionals often notice ranking fluctuations occurring in waves during a core update rollout, typically lasting two to three weeks. This pattern has led to speculation that updates are either:
- Fully deployed at once and then refined, or
- Released incrementally in stages
Mueller’s explanation sheds light on why this volatility occurs.
Core Updates Are Not One-Time Deployments
Google does not define or officially announce “stages” for core updates. However, because these updates involve broad and complex changes across multiple systems, they are often rolled out step by step rather than in a single push. This gradual deployment is one of the main reasons why:
- Core updates take time to complete
- Ranking fluctuations appear uneven
- Different sites are impacted at different times
In short, what appears as “waves” in search rankings may actually reflect different parts of Google’s systems being updated progressively.
No Single “Core Update Machine”
Another important takeaway is that there isn’t a fixed process behind every core update. Instead, each update depends on:
- The systems being modified
- The teams working on those changes
- The nature of improvements being implemented
This means no two core updates are exactly alike. Some may roll out faster, while others take longer depending on complexity.
Incremental Rollouts Explain Ranking Shifts
Mueller’s explanation strongly suggests that core updates are often incremental rather than instantaneous. As different systems go live at different times:
- Rankings may shift multiple times
- Some websites may see delayed impact
- Volatility can continue throughout the rollout period
This step-by-step rollout model better explains why search results don’t stabilize immediately.
The Connection Between Spam Updates and Core Updates
Interestingly, core updates are sometimes preceded by spam updates—like the March 2026 Spam Update. This sequence may not be coincidental. Spam updates can:
- Remove low-quality or manipulative content
- Prepare the search ecosystem for broader changes
- Help improve the effectiveness of upcoming core updates
In many cases, Google aims to surface more relevant, high-quality content while reducing visibility for spammy pages.
A Look Back: How Google Updates Have Evolved
In the early days of Google, updates were simpler and more predictable. Monthly updates often caused dramatic ranking shifts, commonly referred to as the “Google Dance.” However, things changed significantly around major updates like the Florida Update in 2003. That’s when:
- Ranking systems became more sophisticated
- Algorithm changes had deeper impacts
- Fluctuations could last for extended periods
Today’s core updates are far more complex, involving not just ranking algorithms but also the underlying infrastructure that supports them.
Understanding Core Updates Like Software Systems
A useful way to think about core updates is to compare them to software systems:
- The ranking algorithms act like applications
- Google’s infrastructure functions like the operating system
- Updates can affect both layers simultaneously
This explains why some changes are gradual—certain improvements require deeper system-level adjustments before they fully take effect.
Staying ahead of Google’s evolving algorithms requires more than just reacting to ranking changes—it demands a strategic, data-driven approach. At SEO Guru NYC, we specialize in helping businesses navigate core updates, minimize volatility risks, and maintain consistent search visibility.
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