Flying Scripts by WP Speed Matters


Download and execute JavaScript on user interaction.

Quick Links

Flying Scripts delay the execution of JavaScript until there is no user activity. You can specify keywords to include JavaScripts to be delayed. There is also a timeout which executes JavaScript when there is no user activity.

Why should I use this plugin?

JavaScript is very resource-heavy. By delaying the execution of non-critical JavaScript (that are not needed for the initial render), you’re prioritizing and giving more resources to critical JavaScript files. This way you will reduce render time, time to interactive, first CPU idle, max Potential input delay etc. This will also reduce initial payload to browsers by reducing the no. of requests.



  1. Visit ‘Plugins > Add New’
  2. Search for ‘Flying Scripts’
  3. Activate Flying Scripts for WordPress from your Plugins page.
  4. Visit Settings -> Flying Scripts to configure


What are the ideal scripts to be included?

Any script that is not crucial for rendering the first view or above fold contents. 3rd party scripts like tracking scripts, chat plugins, etc are ideal.

What should I put in include keywords

Any keyword inside your inline script that uniquely identifies that script. For example “fbevents.js” for Facebook Pixel, “gtag” for Google Tag Manager, “customerchat.js” for Facebook Customer Chat plugin.

How is it different from `defer`

defer tells browser to download the script when found and execute it when HTML parsing is complete. When you include a script in Flying Scripts, those scripts won’t be executed until there is a user interaction.

What is user interaction?

Events from the user like mouse hover, scroll, keyboard input, touch in mobile device, etc.

What is timeout?

Even if there is no user interaction, scripts will be executed after the specified timeout.


September 5, 2021
Score on PageSpeed Insights Mobile: 42 to 97 Desktop: 72 to 100
June 25, 2021
This plugin was the last piece of the puzzle that brought my PSI mobile score from 92 to 100. Super easy to use, and works exactly as expected. Cheers!
December 9, 2020
When a user access a website they need first what they want. For example, when someone land to a blog firstly they want to see Title, Entry meta, featured image, paragraph, etc intstead directly jumping to comment section. And, there are time when comment section is powered by any 3rd-party script, this is simply a brilliant solution to perform smart defer in such case without affecting user-experience. Another case, if you're using Google AdSense this plugin can help in loading Advt in right moment. This can also help in boosting Core Vital possibly.
Read all 23 reviews

Contributors & Developers

“Flying Scripts by WP Speed Matters” is open source software. The following people have contributed to this plugin.




  • Fix – Added mouse wheel event for user interaction


  • Fix – FacetWP compatibility


  • New – Exclude on pages
  • New – Set timeout to Never


  • Security updates


  • [BUGFIX] Disable for admin interface when using W3 Total Cache


  • [BUGFIX] Support for W3 Total Cache


  • [REMOVED] Unnecessary “scroll” event


  • [UPDATE] Set data-type='lazy' instead of type='lazy'. Removed setting type='text/javascript' via JavaScript


  • [BUGFIX] Remove event listeners after scripts are loaded


  • [UPDATE] Copy updates


  • [UPDATE] Minified JavaScript
  • [UPDATE] Updated copy, FAQ


  • [BUGFIX] Exclude json and other script tags


  • [NEW] Load scripts on user interaction
  • [REMOVED] Load scripts after delay


  • Initial release