If you don’t follow their tuning guide, Nextcloud does run very poorly on SQLite and without Redis/caching. Apache also performs significantly worse than nginx + php-fpm.
https://docs.nextcloud.com/server/latest/admin_manual/installation/server_tuning.html
It does run very well with Postgres + Redis + php-fpm + OPcache and has been pretty much the center of my selfhosting endeavor since ownCloud times.
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