icurdinj

If you want to enable your WordPress site to send HTTP 103 Early Hints header, you can do so by installing this plugin.
It will: 
1. Check if the server supports HTTP 103 Early Hints. 
2. If it does, the plugin will prepare everything needed to send the header.
Right now, this plugin supports recent versions of Apache web server – 2.4.58 and newer, and FrankenPHP web server – 
v1.2 and newer.
Also, your site needs to be served over HTTP/2 protocol. (If it’s not, the browsers would ignore the header.)
<h3>License</h3>
This plugin is free software: you can redistribute it and/or modify 
it under the terms of the GNU General Public License as published by 
the Free Software Foundation, either version 2 of the License, or 
(at your option) any later version.
This plugin is distributed in the hope that it will be useful, 
but WITHOUT ANY WARRANTY; without even the implied warranty of 
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
GNU General Public License for more details.
You should have received a copy of the GNU General Public License 
along with this plugin. If not, see <a href="https://www.gnu.org/licenses/" rel="nofollow ugc">https://www.gnu.org/licenses/</a>.

Easy HTTP 103

Improves the speed of your site by sending HTTP 103 Early Hints header.

Brad Jorsch

Andrija Vučinić

Brandon Payton

rcrdortiz

mreishus

This plugin supports a few features that may improve the performance of page loading and rendering in the browser:
<ul>
<li>Concatenate CSS</li>
<li>Concatenate JavaScript</li>
<li>Execution timing of non-critical scripts
<ul>
<li>Note: Changing script execution timing can be risky and will not work well for all sites.</li>
</ul>
</li>
</ul>
<h3>Testing</h3>
To test features without enabling them for the entire site, you may append query params to a WordPress post or page URL. For example, to test enabling JavaScript concatenation for <code>https://example.com/blog/</code>, you can use the URL <code>https://example.com/blog/?concat-js=1</code>.
Supported query params:
<ul>
<li><code>concat-css</code> controls CSS concatenation. Values: <code>1</code> for ON and <code>0</code> for OFF.</li>
<li><code>concat-js</code> controls JavaScript concatenation. Values: <code>1</code> for ON and <code>0</code> for OFF.</li>
<li><code>load-mode-js</code> controls how non-critical JavaScript are loaded. Values: ‘defer’ for <a href="https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script#attr-defer" rel="nofollow ugc">deferred</a>, ‘async’ for <a href="https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script#attr-async" rel="nofollow ugc">async loading</a>, any other value indicates the feature should be disabled.</li>
</ul>
<h4>PHPUnit (Docker)</h4>
You can run the PHPUnit tests locally using Docker (no local MySQL required).
First time (or after changing DB credentials):
<pre><code>docker compose down -v
</code></pre>
Run tests:
<pre><code>docker compose up --build --abort-on-container-exit --exit-code-from tests
</code></pre>
Optional overrides (examples):
<ul>
<li><code>WP_VERSION=6.5 docker compose up --build --abort-on-container-exit --exit-code-from tests</code></li>
<li><code>PHP_VERSION=7.4 docker compose up --build --abort-on-container-exit --exit-code-from tests</code></li>
<li><code>PHPUNIT_VERSION=9.6.20 docker compose up --build --abort-on-container-exit --exit-code-from tests</code></li>
</ul>

Page Optimize

Optimize pages for faster load and render in the browser.

Easy HTTP 103 vs Page Optimize