Crucial Steps to Improve the Performance and User Engagement of Your WordPress Theme;
Make use of lightweight Js
Instead of employing Js frameworks or libraries that slow down your theme while it is being developed, you must include vanilla Js for faster loading times. When compared to conventional Js, the JQuery framework slows down your theme, therefore do not utilize it extensively. If you want something with better DOM manipulation than JQuery, React Js might be a better option.
Make Use fluid styling
To enhance your assets’ appearance across various devices like desktops, tablets, and mobiles, it’s crucial to utilize fluid styling. Implementing responsive sizes using percentages, REM, or EM units will ensure everything maintains its intended arrangement.
Enhance the image
Lazy loading, complete responsive features (auto-height, object-fit, and block display units), or both must be integrated to optimize the image. These features improve user experience and speed by minimizing both initial and subsequent browser interactions.
Reduce DOM size
When developing your theme, keep things small so that HTML markup is not too slow to be able to connect to the browser, and omit unnecessary containers like DIV when building your theme.
Reduce number of global variables
As you are aware, global variables represent the call execution process even after the task has finished, which can lead to increased PHP connection time in comparison to local variables. Local variables, on the other hand, always terminate after the execution of the code, thereby minimizing repeated requests when compared to global variables.
Reduce unused assets such as CSS and JS
You must decrease the execution of unneeded Js and CSS while designing your theme. You must load CSS and Js on specific call-up actions rather than all pages; to do so, separate these assets into several assets and enqueue them solely for specific container loading.