Timing tests for https://core.trac.wordpress.org/ticket/56849

constant-to-pre-option.php

<?php
namespace PWCC\Nope\PreOptionTesting;

const RUNS = 10000;
// return;
add_action( 'init', function(){
	$run_time = 0;

	get_option( 'siteurl' );
	for( $i = RUNS; $i > 0; $i-- ) {
		$time_start = microtime( true );
		get_option( 'siteurl' );
		$run_time += microtime( true ) - $time_start;
	}

	echo '<pre>';
	echo 'option_siteurl: ' . ( $run_time / RUNS ) . ' seconds' . PHP_EOL;
	echo '</pre>';
}, 10 );


add_action( 'init', function(){
	remove_filter( 'option_home', '_config_wp_home' );
	remove_filter( 'option_siteurl', '_config_wp_siteurl' );

	add_filter( 'pre_option_home', '_config_wp_home' );
	add_filter( 'pre_option_siteurl', '_config_wp_siteurl' );

	$run_time = 0;

	get_option( 'siteurl' );
	for( $i = RUNS; $i > 0; $i-- ) {
		$time_start = microtime( true );
		get_option( 'siteurl' );
		$run_time += microtime( true ) - $time_start;
	}

	echo '<pre>';
	echo 'pre_option_siteurl: ' . ( $run_time / RUNS ) . ' seconds' . PHP_EOL;
	echo '</pre>';
}, 20 );


add_action( 'init', function(){
	exit;
}, 30 );