前述までのWordPressインストール直後のHelloWorldページプロファイリング、
0.896秒、70.0%の処理時間を要した run_init::wordpress/wp-load.php の処理を追いかけてみる。

run_init::wordpress/wp-load.php

wp-load.phpをたどると、主だった処理は次の処理。
load_default_textdomain 470,612 52.6%
do_action 199,482 22.3%

php
run_init::wordpress/wp-load.php
 run_init::wordpress/wp-config.php
  run_init::wordpress/wp-settings.php
   load_default_textdomain ※1
   do_action               ※2   
   WP_Locale::__construct   
   create_initial_post_types    
   run_init::wp-includes/default-filters.php    
   create_initial_taxonomies    
   load::wp-includes/post.php   
   load::wp-includes/formatting.php 
   load::wp-includes/taxonomy.php   
   load::wp-includes/query.php

run_init::wordpress/wp-load.php

Function Name Calls Calls% Incl. Wall Time
(microsec)
IWall%
Current Function
run_init::wordpress/wp-load.php 1 9.1% 896,496 70.0%
Exclusive Metrics for Current Function 198 0.0%
Parent function
run_init::wordpress/wp-blog-header.php 1 100.0% 896,496 100.0%
Child functions
run_init::wordpress/wp-config.php 1 16.7% 896,214 100.0%
file_exists 1 16.7% 25 0.0%
load::wordpress/wp-config.php 1 16.7% 19 0.0%
error_reporting 1 16.7% 18 0.0%
define 1 16.7% 12 0.0%
dirname 1 16.7% 10 0.0%

run_init::wordpress/wp-config.php

Function Name Calls Calls% Incl. Wall Time

(microsec)
IWall%
Current Function
run_init::wordpress/wp-config.php 1 4.2% 896,214 70.0%
Exclusive Metrics for Current Function 219 0.0%
Parent function
run_init::wordpress/wp-load.php 1 100.0% 896,214 100.0%
Child functions
run_init::wordpress/wp-settings.php 1 5.3% 895,009 99.9%
load::wordpress/wp-settings.php 1 5.3% 824 0.1%
define 16 84.2% 153 0.0%
defined 1 5.3% 9 0.0%

run_init::wordpress/wp-settings.php

Function Name Calls Calls% Incl. Wall Time

(microsec)
IWall%
Current Function
run_init::wordpress/wp-settings.php 1 0.6% 895,009 69.9%
Exclusive Metrics for Current Function 2,872 0.3%
Parent function
run_init::wordpress/wp-config.php 1 100.0% 895,009 100.0%
Child functions
load_default_textdomain 1 0.6% 470,612 52.6%
do_action 7 4.2% 199,482 22.3%
WP_Locale::__construct 1 0.6% 18,744 2.1%
create_initial_post_types 1 0.6% 18,470 2.1%
run_init::wp-includes/default-filters.php 1 0.6% 14,994 1.7%
create_initial_taxonomies 1 0.6% 13,665 1.5%
load::wp-includes/post.php 1 0.6% 10,678 1.2%
load::wp-includes/formatting.php 1 0.6% 9,463 1.1%
load::wp-includes/taxonomy.php 1 0.6% 7,127 0.8%
load::wp-includes/query.php 1 0.6% 6,704 0.7%
load::wp-includes/link-template.php 1 0.6% 5,437 0.6%
wp_not_installed 1 0.6% 5,393 0.6%
load::wp-includes/general-template.php 1 0.6% 5,215 0.6%
load::wp-includes/deprecated.php 1 0.6% 5,078 0.6%
load::wp-includes/pluggable.php 1 0.6% 4,661 0.5%
load::wp-includes/comment.php 1 0.6% 4,162 0.5%
load::wp-includes/class-http.php 1 0.6% 3,712 0.4%
run_init::wp-includes/script-loader.php 1 0.6% 3,538 0.4%
load::wp-includes/comment-template.php 1 0.6% 3,434 0.4%
load::wp-includes/post-template.php 1 0.6% 3,418 0.4%
load::wp-includes/theme.php 1 0.6% 3,338 0.4%
load::wp-includes/media.php 1 0.6% 3,320 0.4%
load::wp-includes/script-loader.php 1 0.6% 3,272 0.4%
load::wp-includes/user.php 1 0.6% 3,016 0.3%
load::wp-includes/rewrite.php 1 0.6% 2,960 0.3%
wp_cookie_constants 1 0.6% 2,565 0.3%
load::wp-includes/class-wp-theme.php 1 0.6% 2,505 0.3%
load::wp-includes/widgets.php 1 0.6% 2,449 0.3%
load::wp-includes/category-template.php 1 0.6% 2,430 0.3%
load::wp-includes/canonical.php 1 0.6% 2,367 0.3%
load::wp-includes/capabilities.php 1 0.6% 2,354 0.3%
load::wp-includes/kses.php 1 0.6% 2,266 0.3%
WP::init 1 0.6% 2,253 0.3%
require_wp_db 1 0.6% 2,072 0.2%
load::wp-includes/meta.php 1 0.6% 1,905 0.2%
load::wp-includes/admin-bar.php 1 0.6% 1,794 0.2%
load::wp-includes/nav-menu.php 1 0.6% 1,785 0.2%
load::wp-includes/nav-menu-template.php 1 0.6% 1,466 0.2%
run_init::wp-includes/media.php 1 0.6% 1,433 0.2%
load::wp-includes/class-wp.php 1 0.6% 1,412 0.2%
load::wp-includes/update.php 1 0.6% 1,376 0.2%
wp_templating_constants 1 0.6% 1,311 0.1%
wp_set_wpdb_vars 1 0.6% 1,308 0.1%
load::wp-includes/default-filters.php 1 0.6% 1,222 0.1%
wp_start_object_cache 1 0.6% 1,213 0.1%
load::twentyeleven/functions.php 1 0.6% 1,172 0.1%
run_init::pomo/mo.php 1 0.6% 1,097 0.1%
run_init::wp-includes/update.php 1 0.6% 1,055 0.1%
wp_plugin_directory_constants 1 0.6% 1,012 0.1%
load::wp-includes/feed.php 1 0.6% 990 0.1%
wp_get_active_and_valid_plugins 1 0.6% 977 0.1%
load::wp-includes/bookmark.php 1 0.6% 905 0.1%
load::wp-includes/cron.php 1 0.6% 897 0.1%
wp_magic_quotes 1 0.6% 862 0.1%
load::wp-includes/author-template.php 1 0.6% 839 0.1%
wp_set_internal_encoding 1 0.6% 834 0.1%
load::wp-includes/class-wp-walker.php 1 0.6% 772 0.1%
run_init::wp-includes/kses.php 1 0.6% 695 0.1%
run_init::wp-includes/pluggable.php 1 0.6% 662 0.1%
load::wp-includes/template.php 1 0.6% 657 0.1%
load::wp-includes/default-constants.php 1 0.6% 636 0.1%
run_init::twentyeleven/functions.php 1 0.6% 621 0.1%
WP_Rewrite::__construct 1 0.6% 604 0.1%
load::wp-includes/vars.php 1 0.6% 537 0.1%
load::wp-includes/category.php 1 0.6% 535 0.1%
run_init::wp-includes/post.php 1 0.6% 503 0.1%
load::wp-includes/bookmark-template.php 1 0.6% 479 0.1%
load::wp-includes/shortcodes.php 1 0.6% 445 0.0%
run_init::wp-includes/theme.php 1 0.6% 409 0.0%
wp_initial_constants 1 0.6% 404 0.0%
run_init::wp-includes/general-template.php 1 0.6% 349 0.0%
load::wp-includes/pluggable-deprecated.php 1 0.6% 341 0.0%
run_init::wp-includes/admin-bar.php 1 0.6% 263 0.0%
run_init::wp-includes/rewrite.php 1 0.6% 250 0.0%
run_init::wp-includes/vars.php 1 0.6% 246 0.0%
load::wp-includes/functions.php 1 0.6% 227 0.0%
wp_fix_server_vars 1 0.6% 212 0.0%
run_init::wp-includes/canonical.php 1 0.6% 195 0.0%
WP_Widget_Factory::WP_Widget_Factory 1 0.6% 163 0.0%
is_multisite 5 3.0% 159 0.0%
run_init::wp-includes/taxonomy.php 1 0.6% 155 0.0%
wp_set_lang_dir 1 0.6% 148 0.0%
run_init::wp-includes/functions.php 1 0.6% 143 0.0%
wp_ssl_constants 1 0.6% 141 0.0%
run_init::wp-includes/pluggable-deprecated.php 1 0.6% 135 0.0%
run_init::wp-includes/nav-menu-template.php 1 0.6% 128 0.0%
run_init::wp-includes/author-template.php 1 0.6% 125 0.0%
run_init::wp-includes/user.php 1 0.6% 123 0.0%
wp_functionality_constants 1 0.6% 122 0.0%
load::wp-includes/l10n.php 1 0.6% 111 0.0%
run_init::wp-includes/shortcodes.php 1 0.6% 92 0.0%
load::wp-includes/load.php 1 0.6% 91 0.0%
run_init::wp-includes/widgets.php 1 0.6% 87 0.0%
run_init::wp-includes/compat.php 1 0.6% 81 0.0%
load::wp-includes/http.php 1 0.6% 79 0.0%
register_theme_directory 1 0.6% 73 0.0%
wp_get_mu_plugins 1 0.6% 68 0.0%
wp_check_php_mysql_versions 1 0.6% 67 0.0%
validate_file 1 0.6% 67 0.0%
load::wp-includes/plugin.php 1 0.6% 63 0.0%
load::wp-includes/class-wp-error.php 1 0.6% 62 0.0%
load::wp-includes/locale.php 1 0.6% 61 0.0%
load::pomo/mo.php 1 0.6% 60 0.0%
load::wp-includes/post-thumbnail-template.php 1 0.6% 56 0.0%
load::wp-includes/compat.php 1 0.6% 56 0.0%
run_init::wp-includes/deprecated.php 1 0.6% 53 0.0%
run_init::wp-includes/category-template.php 1 0.6% 51 0.0%
run_init::wp-includes/post-template.php 1 0.6% 50 0.0%
is_readable 1 0.6% 50 0.0%
wp_maintenance 1 0.6% 49 0.0%
file_exists 1 0.6% 46 0.0%
run_init::wp-includes/formatting.php 1 0.6% 44 0.0%
run_init::wp-includes/link-template.php 1 0.6% 43 0.0%
load::wp-includes/class-wp-ajax-response.php 1 0.6% 42 0.0%
get_locale 1 0.6% 42 0.0%
get_theme_root 1 0.6% 42 0.0%
run_init::wp-includes/comment-template.php 1 0.6% 41 0.0%
run_init::wp-includes/class-wp-theme.php 1 0.6% 39 0.0%
run_init::wp-includes/comment.php 1 0.6% 38 0.0%
run_init::wp-includes/query.php 1 0.6% 35 0.0%
wp_debug_mode 1 0.6% 32 0.0%
run_init::wp-includes/nav-menu.php 1 0.6% 31 0.0%
date_default_timezone_set 1 0.6% 30 0.0%
define 2 1.2% 28 0.0%
run_init::wp-includes/meta.php 1 0.6% 28 0.0%
timer_start 1 0.6% 28 0.0%
run_init::wp-includes/class-http.php 1 0.6% 28 0.0%
run_init::wp-includes/capabilities.php 1 0.6% 28 0.0%
load::wp-includes/version.php 1 0.6% 27 0.0%
run_init::wp-includes/feed.php 1 0.6% 26 0.0%
wp_unregister_GLOBALS 1 0.6% 25 0.0%
run_init::wp-includes/cron.php 1 0.6% 24 0.0%
ini_set 2 1.2% 24 0.0%
run_init::wp-includes/l10n.php 1 0.6% 23 0.0%
run_init::wp-includes/version.php 1 0.6% 23 0.0%
run_init::wp-includes/class-wp.php 1 0.6% 22 0.0%
run_init::wp-includes/class-wp-walker.php 1 0.6% 21 0.0%
run_init::wp-includes/bookmark.php 1 0.6% 21 0.0%
run_init::wp-includes/template.php 1 0.6% 20 0.0%
defined 2 1.2% 19 0.0%
run_init::wp-includes/default-constants.php 1 0.6% 18 0.0%
run_init::wp-includes/category.php 1 0.6% 17 0.0%
run_init::wp-includes/load.php 1 0.6% 16 0.0%
run_init::wp-includes/locale.php 1 0.6% 15 0.0%
run_init::wp-includes/bookmark-template.php 1 0.6% 15 0.0%
run_init::wp-includes/plugin.php 1 0.6% 14 0.0%
WP_Query::__construct 1 0.6% 14 0.0%
run_init::wp-includes/http.php 1 0.6% 14 0.0%
register_shutdown_function 1 0.6% 13 0.0%
wp_favicon_request 1 0.6% 12 0.0%
run_init::wp-includes/post-thumbnail-template.php 1 0.6% 11 0.0%
run_init::wp-includes/class-wp-error.php 1 0.6% 10 0.0%
run_init::wp-includes/class-wp-ajax-response.php 1 0.6% 9 0.0%
function_exists 1 0.6% 9 0.0%

次は?load_default_textdomain を優先してみてみよう。