Googlebot Crawling Secrets and SEO Rules

If you're interested in SEO or website development, you’ve probably asked yourself this question before:
How does Google actually see your website? 🤔
In a recent video on the Google Search Central channel, there was a technical discussion between Martin Splitt and Gary Illyes from Google’s Search Relations team.

The conversation revealed several important details about Google’s crawling infrastructure and corrected many misconceptions that have been circulating among developers and SEO experts.
Let’s break it down in a simple way 👇

What Is Googlebot and How Does It Work? 🤖​

Many people think that Googlebot is just a single program that visits websites and reads pages.
But the reality is a bit different.
Google operates a massive infrastructure that works similarly to a Software as a Service (SaaS) system.
This means that whenever any team within Google needs to collect data from the web, they submit a request to this internal system.

That request usually includes information such as:

• The User-Agent type
• The amount of data required
• The method of crawling the website

After that, the system automatically sends the appropriate crawler to collect the required data.

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Google Protects Your Server From Overload ⚡​

One important point mentioned in the video is that Google does not want to overload your website.
If your server starts slowing down or returning errors such as:

• 503 Server Error
• Extremely slow response times

Google’s crawler activates something called Throttling.

This simply means it will:

• Reduce the number of requests
• Slow down the crawling rate
• Maintain server stability

So Google actually tries to avoid putting excessive load on your server.

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Geo-Blocking Problems and Their Impact on Indexing 🌍​

Here’s something many people don’t realize:
Most Googlebot crawling operations originate from U.S. IP addresses.
If you enable Geo-blocking and block traffic from the United States, Google may not be able to properly access your site.
Some people assume Googlebot can easily switch to IP addresses from other countries, but in reality this is:

• Very rare
• Not guaranteed

So if you care about SEO, make sure your website is accessible from the United States.

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Maximum HTML Page Size Limit 📄​

Google does not always read the entire page. There is something called a Truncation Limit.
This means there is a maximum size of page content that Google processes.
Roughly speaking:

• Google systems may retrieve data up to 15MB
• But for search indexing, Google typically processes only the first 2MB of HTML

This means that if your page is very large:

• Google may read only the beginning
• The rest of the content might be ignored

That’s why it’s always recommended to:

• Reduce page size
• Remove unnecessary code
• Use Lazy Loading for images

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The Difference Between a Crawler and a Fetcher 🧠​

The video also explained an important difference between two types of systems.

Crawler​

This is responsible for automatic crawling of websites.
Examples include:

• Reading web pages
• Discovering new links
• Updating search indexes

Fetcher​

This works when a direct request is made.
Examples include:

• Inspecting a URL using Google tools
• Testing a page

In simple terms:

• Crawler = automated crawling
• Fetcher = direct on-demand request

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Google Uses Caching to Reduce Load on Websites 💾​

Google is very efficient when dealing with servers.
If services such as:

• Google Search
• Google News

Need the same page at the same time, the system does not send multiple requests to your server.
Instead, it uses internal caching.
That means Google will:

• Store a copy of the page
• Share it between different services

This significantly reduces the load on your server.

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Simple Example to Check Googlebot on Your Server 🧑‍💻​

If you manage a website or server, you can track Googlebot activity through server logs.
Example in Linux:

grep "Googlebot" access.log

If you want to control crawling using robots.txt, you can do something like this:

User-agent: Googlebot
Allow: /

User-agent: *
Disallow: /private/

This configuration allows Googlebot to access the entire website, while blocking other bots from a specific directory.

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Why This Video Matters for Developers and SEO Experts 🚀​

This video provides a clearer picture of:

• How Googlebot works
• The structure of Google’s crawling infrastructure
• HTML reading limits
• The impact of geo-blocking on indexing

If you understand these points well, you’ll be able to:

• Improve your SEO performance
• Help Google crawl your website more efficiently
• Reduce indexing issues

And that can make a significant difference in your search rankings.

👆 Click The Image To Watch The Video 👆