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Tips on Customizing WP Performance

How to Hide the "WP Performance" Admin Menu

function plt_hide_wp_performance_menus() {
	//Hide the "WP Performance" menu.
	remove_menu_page('wp-performance');
}

add_action('admin_menu', 'plt_hide_wp_performance_menus', 11);

Where do I put this code?

How to Hide the "WP Performance Settings" Meta Box

function plt_hide_wp_performance_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "WP Performance Settings" meta box.
	remove_meta_box('wpp_page_cache_metabox', $screen->id, 'side');
}

add_action('add_meta_boxes', 'plt_hide_wp_performance_metaboxes', 20);

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