"When crawling for Google Search, Googlebot crawls the first 2MB of a supported file type, and the first 64MB of a PDF file. From a rendering perspective, each resource referenced in the HTML (such as CSS and JavaScript) is fetched separately, and each resource fetch is bound by the same file size limit that applies to other files (except PDF files).Once the cutoff limit is reached, Googlebot stops the fetch and only sends the already downloaded part of the file for indexing consideration."
"By default, Google's crawlers and fetchers only crawl the first 15MB of a file. Any content beyond this limit is ignored. Individual projects may set different limits for their crawlers and fetchers, and also for different file types. For example, a Google crawler may set a larger file size limit for a PDF than for HTML."
Google's crawling limits distinguish default and file-type-specific caps. By default, Google's crawlers and fetchers fetch the first 15MB of any file; anything beyond is ignored. Googlebot specifically fetches the first 2MB of a supported file type and the first 64MB of a PDF. Resources referenced in HTML (such as CSS and JavaScript) are fetched separately and each resource fetch is bound by the same file-size limit that applies to other files, except PDFs. Once a cutoff is reached, Googlebot stops the fetch and sends only the already downloaded portion for indexing. File-size limits apply to uncompressed data.
Read at Search Engine Roundtable
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