Large enterprise and e-commerce sites now have official Google guidance on reducing unnecessary crawler load. Google updated its "Optimize Your Crawl Budget" documentation on July 22, 2026, adding two substantive directives: a recommendation to implement HTTP 304 (Not Modified) status codes for unchanged pages, and a new disclosure that all of Google's crawlers draw from a single shared crawl capacity limit per site.
Who the Documentation Targets
Google's July 22 update targets large sites, those with over one million pages that change moderately often, or medium-sized sites with more than 10,000 pages that update daily. Site operators running large-scale properties are the intended audience; for smaller sites, Google's position remains that crawl budget is not something that needs to be actively managed.
Google's Crawlers Share a Single Capacity Limit
One of the two new additions to the documentation establishes, for the first time in writing, that crawl capacity is not siloed by crawler type. Google's various crawlers, including Googlebot-Image and the primary Googlebot, share a website's overall crawl capacity, meaning that significant demand from one type of crawler can reduce the capacity available for others, impacting how quickly new or updated content is discovered.
Heavy demand from one crawler, including AI-training crawlers, can reduce what remains available for Googlebot. The updated documentation states directly: "While each crawler has a different crawl demand, the crawl capacity limit is shared across all crawlers. This means that high demand from one crawler can reduce the capacity available for others."
The 304 Not Modified Recommendation
The second addition is a directive to support HTTP 304 (Not Modified) responses as part of server-side HTTP caching. Google's updated documentation, published July 22, states:
"Use HTTP caching: Support 304 (Not Modified) HTTP status codes. If a page hasn't changed since Google last crawled it, returning a 304 code tells Google to reuse the cached version, saving your server bandwidth and resources."
Despite being a 3xx code, the 304 Not Modified response differs from typical 301 or 302 redirects. The Mozilla Developer Network clarifies that a 304 response indicates that the resource has not been modified, rather than directing the client to a new location.
When Googlebot sends a conditional request with the cached validator and a server replies with 304, Googlebot reuses its cached copy instead of downloading the full page again. That saves crawl quota, which means Googlebot can visit more of a site within the same crawl window.
Every Site Starts at the Same Conservative Crawl Limit
The July 22 update also formalized language around how crawl capacity is initially assigned. The headline change: every site now starts on the same default, conservative crawl-capacity limit, and Google's systems raise that limit over time only if there is crawl demand and the site stays healthy.
The documentation further specifies the conditions that cause that limit to move in either direction. If a site slows down, through increased latency or longer response times, or responds with server errors or rate-limiting signals such as HTTP 429, the limit goes down, and Google crawls less. Google is evaluating not only whether a site is fast, but whether it is predictable; a site that typically responds in 200ms but regularly spikes to four seconds under load can be treated worse than a site that steadily returns content at 600ms.
Practical Implications for Large-Site SEO
For enterprise retailers and publishers managing tens or hundreds of thousands of URLs, the 304 recommendation is directly actionable at the server or CDN configuration level. When implemented correctly, pages that have not changed since Googlebot's last visit return a minimal response rather than a full page download, freeing crawl capacity to be allocated to new or recently updated URLs, such as freshly published products or time-sensitive editorial content. The shared-capacity disclosure is equally relevant for sites running Google Shopping or Google Ads dynamic targets alongside standard web crawling, as heavy demand from those crawlers now has confirmed documentation to show it competes directly with Googlebot for the same site-level capacity pool.
Google's updated "Optimize Your Crawl Budget" documentation is published at developers.google.com. Google confirmed the documentation was rewritten on July 22, 2026.
