felixarntz

<?php

function my_func() {
	global $some_metric_global;

	if ( ! isset( $some_metric_global ) ) {
		$some_metric_global = 0.0;
		add_action(
			'wp_footer',
			function() {

felixarntz

CREATE TEMPORARY FUNCTION GET_SERVER_TIMING_HEADER(headers ARRAY<STRUCT<name STRING, value STRING>>) RETURNS STRING AS (
  IFNULL((
    SELECT
      value
    FROM
      UNNEST(headers) AS header
    WHERE
      LOWER(header.name) = 'server-timing'
    LIMIT 1
  ), '')

felixarntz

WP 6.4 Beta 1 Benchmarks

Compared to WP 6.3.1 via https://github.com/swissspidy/compare-wp-performance, based on running:

./run.sh latest https://wordpress.org/wordpress-6.4-beta1.zip

Overview

| Metric | Run 1 Before | Run 1 After | Run 1 Diff % | Run 1 Diff abs. | Run 2 Before | Run 2 After | Run 2 Diff % | Run 2 Diff abs. |

felixarntz

<?php

/**
 * Fix Jetpack Subscriptions block to not uselessly enqueue Thickbox, which in turn enqueues jQuery.
 */
function felixarntz_stop_jetpack_subscriptions_from_enqueuing_thickbox_without_any_usage() {
	if ( wp_script_is( 'jetpack-block-subscriptions' ) && isset( wp_scripts()->registered['jetpack-block-subscriptions'] ) ) {
		$script = wp_scripts()->registered['jetpack-block-subscriptions'];
		$index  = array_search( 'thickbox', $script->deps, true );
		if ( false !== $index ) {

felixarntz

<?php
/**
 * Plugin Name: Server Timing Output Buffer
 * Plugin URI: https://gist.github.com/felixarntz/9c3d7150c74082e69bb426393b68b12e
 * Description: Enables output buffering in the Performance Lab plugin's Server Timing API.
 * Requires at least: 6.1
 * Requires PHP: 5.6
 * Version: 0.1.0
 * Author: Felix Arntz
 * Author URI: https://felix-arntz.me

felixarntz

{
	"$schema": "https://schemas.wp.org/trunk/theme.json",
	"version": 2,
	"settings": {
		"color": {
			"palette": [
				{
					"color": "#ffffff",
					"name": "Base",
					"slug": "base"

felixarntz

<?php
/**
 * Plugin Name: Web Vitals Logger
 * Plugin URI: https://gist.github.com/felixarntz/112c5dcb72ca3af86557550979a5e9dd
 * Description: Logs Core Web Vitals and other useful client-side metrics in the browser console.
 * Requires at least: 6.1
 * Requires PHP: 5.6
 * Version: 0.1.0
 * Author: Felix Arntz
 * Author URI: https://felix-arntz.me

felixarntz

<?php
/**
 * Plugin Name: Server Timing Extra
 * Plugin URI: https://gist.github.com/felixarntz/63c05392dbf7d51cc7f8f4a424b1ff39
 * Description: Exposes additional Server-Timing metrics using the Performance Lab plugin's Server Timing API.
 * Requires at least: 6.1
 * Requires PHP: 5.6
 * Version: 0.1.0
 * Author: Felix Arntz
 * Author URI: https://felix-arntz.me

felixarntz

Mini WordPress core server performance test suite

Purpose

This quick "mini test suite" allows you to easily collect server-side performance metrics for WordPress core development. It does so by utilizing the Server-Timing header.

Usage

1. Paste the code from main.php into pretty much anywhere in WordPress core, e.g. into wp-includes/default-filters.php.
2. Use code like the one in example.com around any code or a specific function that you want to record metrics for.

felixarntz

<?php
add_action(
	'plugins_loaded',
	function() {
		// Utility function that returns a measuring callback for an action hook,
		// which should be registered as a metric within the action as early as possible
		// (see PHP_INT_MIN usage below).
		$get_measure_action_callback = function( $action_hook ) {
			return function( $metric ) use ( $action_hook ) {
				$metric->measure_before();