seo – Google can not retrieve a large sitemap containing 50,000 URLs, or browsers generating it

My sitemap contains 50,000 URLs / 7.8 MB and the following URL syntax:, maquiagem,   2019-10-03T17:12:01-03:00 

The problems are:

• The search console indicates that "The site map could not be read".

• Loading the Sitemap takes 1 hour and Chrome stops working.

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• In Firefox, the Sitemap downloaded in 1483ms and fully loaded after 5 minutes);

Things I did without success:

• disable GZip compression;

• Delete my .htaccess file;

• Create a Test Sitemap with 1 KB URLs and the same syntax that you sent to the Search Console. It worked, but the Sitemap of 50,000 URLs still indicates "" the inability to retrieve the Sitemap ";

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• I tried to inspect the URL directly, but this gave an error and asked to try again later while the 1K URL was working;

• I tried to validate the Sitemap on five different sites (YANDEX, ETC) and all worked without error or warning.

A light?