I have a huge (35000) hierarchical taxonomy for addresses. After addition of the taxonomy, I had to review which plugins and functions to use or not to use. I found that one of the plugins, which is works slow with such taxonomy, was Yoast. It slowly render sitemaps + index sitemap never shows up. It’s totally freezes loading of post editor.
And, the good thing – Rank Math is really faster! Post editor is loads finally. And sitemaps renders way faster, I set 5000 links per file – it was ok.
The only problem that the /sitemap_index.xml is never render same as with Yoast.
I really believe it’s possible for you to optimize the index building for huge amounts of links.
I provide access to my test copy of VPS instance to make your tests, if you need.
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