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When WordPress builds such a list, it runs a check against the function wp_is_large_network(). It sets a limit of 10000 for users and sites, and when you hit that limit, expensive database operations aren't executed anymore. There are two filters with the same name, so you can change the limit. Example: add_filter( 'wp_is_large_network', function( $state, ...


The easiest way is to check for get_current_blog_id(); and adjust your 404 template based on the current blog id. An other option is creating a child theme for every site and adding different page-404 templates.


You just create must-use plugin for your multisite instalation (https://codex.wordpress.org/Must_Use_Plugins), hook to post save action there (https://codex.wordpress.org/Plugin_API/Action_Reference/save_post), and inside action callback check if current user is admin/super admin (https://codex.wordpress.org/Function_Reference/is_super_admin), if so, you ...

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