WordPress snippet: Profiler

functions.php

<?php
function my_profiler()
{
	printf(
		'<!-- %d queries in %.3f seconds using %.2fMB memory -->',
		get_num_queries(),
		timer_stop( 0, 3 ),
		memory_get_peak_usage() / 1024 / 1024
	);
}

if ( WP_DEBUG ) {
	add_action( 'wp_print_footer_scripts', 'my_profiler' );
}