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wp profile monitors key performance indicators of the WordPress execution process to help you quickly identify points of slowness.
Save tens of minutes diagnosing slow WordPress sites. Because you can install and run wp profile on any server that supports WP-CLI, it compliments Xdebug and New Relic by pointing you in the right direction for further debugging. And, because it's a WP-CLI command, using wp profile means you don't have to install a plugin and deal with the painful dashboard of a slow WordPress site.
First, run wp profile to see metrics for each stage of the WordPress load process:
$ wp profile
+------------+---------+------------+-------------+-------------+------------+--------------+-----------+------------+--------------+---------------+
| stage | time | query_time | query_count | cache_ratio | cache_hits | cache_misses | hook_time | hook_count | request_time | request_count |
+------------+---------+------------+-------------+-------------+------------+--------------+-----------+------------+--------------+---------------+
| bootstrap | 2.0408s | 0.0365s | 15 | 93.21% | 412 | 30 | 0.9299s | 3097 | 0s | 0 |
| main_query | 0.0123s | 0.0004s | 3 | 94.29% | 33 | 2 | 0.0098s | 79 | 0s | 0 |
| template | 0.305s | 0.0175s | 179 | 91.02% | 2636 | 260 | 0.1125s | 7777 | 0s | 0 |
+------------+---------+------------+-------------+-------------+------------+--------------+-----------+------------+--------------+---------------+
| total | 2.3582s | 0.0544s | 197 | 92.84% | 3081 | 292 | 1.0522s | 10953 | 0s | 0 |
+------------+---------+------------+-------------+-------------+------------+--------------+-----------+------------+--------------+---------------+
Then, use --stage=<stage> to dive into higher fidelity of a particular stage:
$ wp profile --stage=bootstrap
+-------------------+---------+------------+-------------+-------------+------------+--------------+--------------+---------------+
| hook | time | query_time | query_count | cache_ratio | cache_hits | cache_misses | request_time | request_count |
+-------------------+---------+------------+-------------+-------------+------------+--------------+--------------+---------------+
| | 0.3558s | 0.0014s | 1 | 25% | 1 | 3 | 0s | 0 |
| muplugins_loaded | 0.0002s | 0s | 0 | 50% | 1 | 1 | 0s | 0 |
| | 0.8075s | 0.0007s | 6 | 73.68% | 56 | 20 | 0s | 0 |
| plugins_loaded | 0.4271s | 0s | 0 | 100% | 138 | 0 | 0s | 0 |
| | 0.0046s | 0s | 0 | 100% | 6 | 0 | 0s | 0 |
| setup_theme | 0s | 0s | 0 | | 0 | 0 | 0s | 0 |
| | 0.2401s | 0s | 0 | 100% | 26 | 0 | 0s | 0 |
| after_setup_theme | 0.0007s | 0s | 0 | 100% | 4 | 0 | 0s | 0 |
| | 0.0001s | 0s | 0 | 100% | 2 | 0 | 0s | 0 |
| init | 0.2922s | 0.0016s | 8 | 96.3% | 156 | 6 | 0s | 0 |
| | 0.0277s | 0s | 0 | 100% | 2 | 0 | 0s | 0 |
| wp_loaded | 0.01s | 0s | 0 | | 0 | 0 | 0s | 0 |
+-------------------+---------+------------+-------------+-------------+------------+--------------+--------------+---------------+
| total | 2.166s | 0.0037s | 15 | 84.5% | 392 | 30 | 0s | 0 |
+-------------------+---------+------------+-------------+-------------+------------+--------------+--------------+---------------+
Lastly, when you've found a specific hook you'd like to assess, use --hook=<hook>:
$ wp profile --hook=plugins_loaded
+------------------------------------------------------------+---------+------------+-------------+-------------+------------+--------------+--------------+---------------+
| callback | time | query_time | query_count | cache_ratio | cache_hits | cache_misses | request_time | request_count |
+------------------------------------------------------------+---------+------------+-------------+-------------+------------+--------------+--------------+---------------+
| wp_maybe_load_widgets() | 0.0309s | 0s | 0 | | 0 | 0 | 0s | 0 |
| wp_maybe_load_embeds() | 0.0001s | 0s | 0 | | 0 | 0 | 0s | 0 |
| VaultPress_Hotfixes->protect_jetpack_402_from_oembed_xss() | 0s | 0s | 0 | | 0 | 0 | 0s | 0 |
| _wp_customize_include() | 0s | 0s | 0 | | 0 | 0 | 0s | 0 |
| Debug_Bar_Remote_Requests() | 0s | 0s | 0 | | 0 | 0 | 0s | 0 |
| EasyRecipePlus->pluginsLoaded() | 0.0029s | 0s | 0 | 100% | 4 | 0 | 0s | 0 |
| Gamajo\GenesisHeaderNav\genesis_header_nav_i18n() | 0.0007s | 0s | 0 | | 0 | 0 | 0s | 0 |
| DS_Public_Post_Preview::init() | 0s | 0s | 0 | | 0 | 0 | 0s | 0 |
| wpseo_load_textdomain() | 0.0006s | 0s | 0 | | 0 | 0 | 0s | 0 |
| load_yoast_notifications() | 0.003s | 0s | 0 | | 0 | 0 | 0s | 0 |
| wpseo_init() | 0.101s | 0s | 0 | 100% | 70 | 0 | 0s | 0 |
| wpseo_frontend_init() | 0.0003s | 0s | 0 | 100% | 2 | 0 | 0s | 0 |
| Black_Studio_TinyMCE_Plugin->load_compatibility() | 0.0122s | 0s | 0 | | 0 | 0 | 0s | 0 |
| Jetpack::load_modules() | 0.2706s | 0s | 0 | 100% | 62 | 0 | 0s | 0 |
| function(){} | 0s | 0s | 0 | | 0 | 0 | 0s | 0 |
+------------------------------------------------------------+---------+------------+-------------+-------------+------------+--------------+--------------+---------------+
| total | 0.4226s | 0s | 0 | 100% | 138 | 0 | 0s | 0 |
+------------------------------------------------------------+---------+------------+-------------+-------------+------------+--------------+--------------+---------------+
Et voila! You've identified some of the sources of slowness.
