automatically echo to the screen

gistfile1.php

<?php
/**
 * automatically echo to the screen using transient
 * 
 * @link http://speckyboy.com/2011/12/14/website-speed-part-3-caching-wordpress/
 * /

$loop_output = get_transient( 'loopOutput' );
if ( false === $loop_output ) {
 
       // Show the last 100 published posts.
       $query = array('post_per_page' => 100,
                      'post_status' => 'publish' ) ;
 
       // run the query
       $loop = new WP_Query($query);
 
       // start the output buffer to save contents of loop
       ob_start();
 
            // do normal loop stuff
            if ($loop->have_posts()) : while ($loop->have_posts()) : $loop->the_post();
 
                // show content or whatever you like
                ?><h1><?php the_title() ?></h1><?php
                the_content();
 
            endwhile;endif;
 
            // save the output buffer contents in a variable
            $loop_output = ob_get_contents();
 
       // clean the buffer as we will be using the variable from now on
       ob_end_clean();
 
       // transient set to last for 1 hour
       set_transient('loopOutput', $loop_output, 60*60);
}
 
// output the new created loop if loop content does not exist. 
echo $loop_output;
 
?>