Example Shortcode that displays query results and caches with transient

shortcode-transient-query-results.php

<?php
// Shortcode to display query results of CPT query
// with transient caching

add_shortcode( 'query_results', 'fe_query_results' );
add_action( 'save_post', 'fe_query_results_delete_transient' );

function fe_query_results( $atts ) {
	global $post;
	$transient_key = 'fe_query_results_transient_key';
	$transient_time = 24 * HOUR_IN_SECONDS;

	// return transient if it exists
	if ( false !== ( $output = get_transient( $transient_key ) ) ) {
		return $output;
	}

	$output = '';

	$args = array(
		'post_type'		=> 'post',
		'order'			=> 'ASC',
		'orderby'		=> 'menu_order',
		'posts_per_page'	=> 200,
		
		// re-enable if you need pagination
		'no_found_rows'         => true,
		
		// re-enable if you use post meta in your output
		'update_post_meta_cache'=> false,
		
		// re-enable if you use terms in your output
		'update_post_term_cache'=> false,
	);

	$fe_query= new WP_Query( $args );

	if ( $fe_query->have_posts() ) {
		$output .= '<ul class="fe-query-results-shortcode-output">';
		while ( $fe_query->have_posts() ) {
			$fe_query->the_post();
			
			$title = get_the_title();
			$link = get_the_permalink();
			
			$output .= "<li><a href=\"{$link}\">{$title}</a></li>";
		}
		$output .= '</ul>';
	} else {
		$output .= '<div class="fe-query-results-shortcode-output-none">No results were found</div>';
	}
	
	wp_reset_postdata();
	
	set_transient( $transient_key, $output, $transient_time );
	
	return $output;
}

function fe_query_results_delete_transient() {
	global $post;
	if ( $post && 'post' === $post->post_type  ) {
		delete_transient( 'fe_query_results_transient_key' );
	}
}