If you've been monitoring your Google Search Console data lately, you've probably noticed something alarming: a dramatic drop in impressions alongside a curious spike in average position. Before you panic, let me assure you that your website hasn't been penalised, and your organic visibility hasn't necessarily collapsed.
What you're witnessing is the fallout from Google's quiet removal of a technical parameter that's been part of the search ecosystem for years. The change, implemented around 10th September 2025, has sent shockwaves through the SEO industry and revealed something rather unsettling about the state of search data.
Without warning or official announcement, Google disabled the &num=100 parameter, a URL modification that allowed users and automated tools to display 100 search results on a single page, rather than the standard 10.
This seemingly minor technical adjustment has had profound consequences. Research analysing 319 websites found that 87.7% of sites experienced impression drops after the change, with desktop impressions taking the biggest hit whilst mobile impressions were affected to a lesser extent.
The reason? This parameter was heavily relied upon by rank tracking tools, SEO platforms, and automated bots to efficiently monitor search rankings at scale. These tools could make a single request to capture 100 results, rather than making 10 separate requests for 10 pages of data.
Here's where it gets interesting, and slightly unsettling. The magnitude of the impression drops has led many in the industry to question just how much of Search Console's impression data was being generated by bots and rank trackers rather than actual human searches.
Google now appears to be limiting retrievable results to the top 20 positions in some cases, effectively capping SERP visibility from an analytics perspective. This means that automated tools can no longer easily track rankings beyond page two, fundamentally altering how impressions are recorded in Search Console.
For years, SEO professionals have noticed peculiar patterns in Search Console data, particularly what became known as the "crocodile effect," where impressions soared whilst clicks remained stable and click-through rates plummeted. Many attributed this to AI Overviews, but the sudden correction following the &num=100 removal suggests bot traffic was inflating the numbers far more than anyone realised.
The good news? If your clicks and traffic are stable, you're seeing a reporting change, not a penalty. It's actually cleaner data.
The removal of the parameter doesn't affect your actual search visibility or rankings. What's changed is how impressions are being counted. Previously, every time a rank tracker checked your position using the &num=100 parameter, it potentially registered as an impression in Search Console, even if no real person saw your listing.
Consider 10th September 2025 as a reset point in your data. Comparing impressions before and after this date won't provide an accurate picture, as you're no longer comparing like with like. Your historical data isn't wrong. It simply reflected a different measurement methodology that included automated traffic.
Major rank tracking providers such as Semrush, Ahrefs, and Moz relied on the &num=100 parameter to efficiently gather large datasets of search engine results page information. Without it, these tools now need to make 10 times as many requests to capture the same data, making the process significantly more resource-intensive.
This operational shift will likely result in increased costs for rank tracking services, potential price rises passed on to subscribers, changes in how frequently rankings can be monitored, and possible limitations on the number of keywords tracked.
Many platforms are still adapting their infrastructure to cope with this change, so expect communications from your SEO tool providers about how they're addressing it.
Despite its imperfections, Google Search Console remains the most authoritative source of data for understanding how your site performs in Google Search. It has its quirks, and we've always had to interpret fluctuations with a healthy dose of scepticism, but there's no superior alternative.
The challenge for SEO professionals now is communicating these data shifts to clients who may not understand the technical nuances. When your client sees a 40% drop in impressions, explaining that it's actually bot traffic being filtered out, whilst reassuring, requires trust and transparency.
What we're still waiting for is better integration of AI Overview performance data within Search Console. Until Google provides more granular insights into how AI-powered search features affect organic visibility, we're left attempting to piece together the puzzle with incomplete information.
Don't panic over the impression drop. Focus on metrics that truly matter.
Clicks: Are actual visitors still finding your site through search?
Traffic quality: Is the traffic converting as expected?
Click-through rate: Whilst this metric has shifted, is it stabilising at the new baseline?
Revenue and conversions: Are your business objectives still being met?
Reconsider your dependence on third-party rank trackers. In an increasingly AI-dominated search landscape, obsessing over specific keyword rankings for hundreds of terms may be becoming less relevant. Search is more personalised, contextual, and dynamic than ever before.
Build first-party data capabilities. The most resilient SEO strategies don't rely solely on external tools. Developing your own tracking methods and focusing on owned data puts you in control when platforms make unexpected changes.
This episode highlights the fragility of relying on third-party data sources and parameters that can be removed at Google's discretion. It also raises uncomfortable questions about how much of the "search activity" we've been monitoring was actually automated traffic rather than genuine user behaviour.
Some have even invoked "dead internet theory," the idea that bots and automated systems now constitute a significant portion of online activity. Whilst that might be overstating things, the scale of the impression drops following this change suggests automated traffic was far more prevalent than most anticipated.
Google has yet to provide detailed public commentary on why this change was implemented now, though John Mueller from Google has somewhat addressed the impression decreasing and average position increasing within Search Console reports following the change. Whether Google will revert this decision or provide alternative solutions for legitimate monitoring tools remains to be seen.
The SEO industry has always been characterised by adaptation. Every algorithm update, interface change, and data adjustment requires us to recalibrate our strategies and reconsider our assumptions.
This latest change is no different, though it's perhaps more revealing than most about the ecosystem we operate within. As search continues its evolution towards AI-powered experiences, our measurement methodologies must evolve as well.
The key is maintaining perspective: tools and metrics change, but the fundamental goal remains the same. Creating valuable content that serves user intent and drives meaningful business outcomes. If you're achieving that, temporary data fluctuations are just noise.
Stay informed, remain adaptable, and remember that genuine organic performance is measured in clicks, conversions, and customer satisfaction, not just impression counts that may or may not reflect reality.
Need help interpreting your Search Console data or adapting your SEO strategy to these changes? Understanding the nuances of search performance data requires experience and expertise that keeps pace with Google's constant evolution.
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