When testing the use of our WordPress site with PageSpeed Insights, if the jQuery library is loaded on the front-end, we tend to get a `not using passive listeners to improve scrolling performance` warning, and Google suggests that we mark touch and scroll wheel event listeners as `passive` to improve the scrolling performance of the page. To...

Development of WordPress themes, in order to ensure the effect, while speeding up the development of speed, we often use some CSS framework. After the completion of theme development, these CSS frameworks in fact, a large part of the CSS styles are not used in the theme. "Delete unused CSS" is an essential step in the optimization of the front-end of the site...

The way PHP executes code is synchronous, which means that the operations defined in PHP are done one after the other. If we need to perform a large number of operations in a single session, or call external APIs, this synchronized execution of code can take a long time, resulting in long wait times for the user. This is a...

JavaScript execution may modify the DOM, affecting the presentation of the page, by default, the first load to execute JavaScript, and then load the execution of the code behind is safe, load the execution of JavaScript code, it will stop the loading and execution of the code behind, this behavior is called blocking, this mode is synchronous loading. This behavior is called blocking, and this pattern is synchronous loading. ...

When loading JavaScript in WordPress themes or plugins, the official recommended method is to use wp_enqueue_script() to load, the function can specify the JavaScript dependency libraries, specify the version of the JavaScript file, set in the header or bottom of the page to load, very flexible and convenient. However, the plugin lacks the ability to specify ...