SEO – Google can not retrieve a large sitemap with 50,000 URLs and is not rendered by browsers

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 reports that the sitemap could not be read.

• Sitemap loading takes 1 hour and Chrome stops working.

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• In Firefox, the sitemap was downloaded in 1483 ms and fully loaded after 5 minutes.

Things that I have done without success:

• Disable GZip compression.

• Delete my .htaccess file;

• Create a test sitemap with 1 KB URLs and the same syntax, and send it to Search Console. However, the sitemap with 50 KB URLs still displays "" that no sitemap can be retrieved.

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• An attempt was made to directly check the URL, but an error occurred and you are asked to try again later while the 1KB URLs worked.

• An attempt was made to validate the sitemap on five different websites (YANDEX, ETC), and all worked without error / warning

Any light?