Sitemap exceeds 50MB uncompressed
What this means
A single sitemap file may be at most 50MB uncompressed. An oversized file is rejected outright, whatever it contains.
How to fix it
Split the sitemap into smaller files behind a sitemap index. Serving it gzipped reduces transfer size but not the uncompressed limit.
Fix effort
This check needs a developer fix: it turns on a routing, hosting or infrastructure decision that no automatic edit can make safely.
Authoritative source
https://developers.google.com/search/docs/crawling-indexing/sitemaps/large-sitemaps
Find every page this affects
CrawlX runs this check — and 161 others — across your whole site, ranks the findings by estimated impact, and opens the fixable ones as pull requests. Free for 500 URLs.