i faced problem that every time sitemap url requested it make high load
so i added a cache feature to the plugin i developed before
github repo url : https://github.com/serv2000/q2a-xml-sitemap-plugin
to activate the plugin set the cache time and enjoy
example : https://arabhelp.org/sitemap.xml
try to open this url and refresh many times
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July 15, 2020: Q2A 1.8.5 released!