Title: Missing source maps for large first-party JavaScript
Last modified: October 10, 2025

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# Missing source maps for large first-party JavaScript

 *  Resolved [Dan Caragea](https://wordpress.org/support/users/dancaragea/)
 * (@dancaragea)
 * [8 months ago](https://wordpress.org/support/topic/missing-source-maps-for-large-first-party-javascript-3/)
 * PageSpeed Insights – Best Practices (mobile and desktop) I get this warning:
 * [https://snipboard.io/qdLCJw.jpg](https://snipboard.io/qdLCJw.jpg)

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Plugin Contributor [wpvideogallery](https://wordpress.org/support/users/wpvideogallery/)
 * (@wpvideogallery)
 * [8 months ago](https://wordpress.org/support/topic/missing-source-maps-for-large-first-party-javascript-3/#post-18676894)
 * The message “Large JavaScript file is missing a sourcemap” in PageSpeed Insights
   is **not an error** and does **not affect your site’s performance or functionality**.
 * Source maps (`.map` files) are optional developer tools that help you **debug
   minified JavaScript** by mapping the compressed code back to the original source.
   They are useful in development or staging environments, but **not required in
   production**.
 * In fact, many production builds **intentionally exclude sourcemaps** to:
    - Reduce file size and loading time
    - Prevent exposing original source code
    - Improve security and privacy
 * So, you can safely ignore this notice. It’s only informational — your site can
   still be fully optimized and production-ready without sourcemaps.
 *  Thread Starter [Dan Caragea](https://wordpress.org/support/users/dancaragea/)
 * (@dancaragea)
 * [8 months ago](https://wordpress.org/support/topic/missing-source-maps-for-large-first-party-javascript-3/#post-18677000)
 * Thank you for prompt response.

Viewing 2 replies - 1 through 2 (of 2 total)

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 * 2 replies
 * 2 participants
 * Last reply from: [Dan Caragea](https://wordpress.org/support/users/dancaragea/)
 * Last activity: [8 months ago](https://wordpress.org/support/topic/missing-source-maps-for-large-first-party-javascript-3/#post-18677000)
 * Status: resolved