Does removing the dashboard widgets cancel the SQL queries in WordPress?

I’m looking to gradually remove as many queries that WordPress does that I don’t find necessary for speed.

I read this article on smashing magazine and one thing mentioned under “COMMENTS” was:

For instance, I killed the ‘Right Now’ and ‘Recent Comments’ sections
of the Dashboard.”

I know there’s a way to remove meta boxes from the dashboard like so:

function remove_dashboard_widgets(){
remove_meta_box('dashboard_right_now', 'dashboard', 'normal'); // Right Now
remove_meta_box('dashboard_recent_comments', 'dashboard', 'normal'); // Recent Comments
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
// use 'dashboard-network' as the second parameter to remove widgets from a network dashboard.
}
add_action('wp_dashboard_setup', 'remove_dashboard_widgets');

My question is: by doing this, will this stop the query to the database completely? Or does it still do it THEN not show it, still taking up a query? I really don’t want to change the core files if possible.