I am not 100% certain if you are looking for a way to remove the Meta-boxes?
If so, following plugin could solve your ‘issue’.
(please backup and so on …)
/**
* Remove Dashboard widgets
*
* @version WordPress 4.6.1
*/
add_action( 'wp_dashboard_setup', 'wpse241195_disable_dashboard_widgets' );
function wpse241195_disable_dashboard_widgets()
{
remove_meta_box( 'dashboard_incoming_links', 'dashboard', 'normal' ); // Incoming Links
remove_meta_box( 'dashboard_plugins', 'dashboard', 'normal' ); // Plugins
remove_meta_box( 'dashboard_quick_press', 'dashboard', 'side' ); // Quick Press
remove_meta_box( 'dashboard_recent_drafts', 'dashboard', 'side' ); // Recent Drafts
remove_meta_box( 'dashboard_primary', 'dashboard', 'side' ); // WordPress blog
remove_meta_box( 'dashboard_secondary', 'dashboard', 'side' ); // Other WordPress News
remove_action( 'welcome_panel', 'wp_welcome_panel' ); // Remove WordPress Welcome Panel
}
It is the complete list, little overdone but as said, adjust to ownwishes.
Note:
This function removes them completely, so if you not wish that you should create a function to just hide them (which not removes them and imho it still will be loading the news feed and more)
See Codex for more information