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jQuery Migrate is a javascript library that allows you to preserve the compatibility of your jQuery code developed for versions of jQuery older than 1.9. It basically restores deprecated features and behaviors so that older code will still run properly on the current jQuery version and later.
Most websites that use up-to-date themes and plugins don’t require jQuery Migrate on the frontend, and thus the script can be safely removed. By removing it, the browser will have one less JavaScript file to download and execute. As a result, your site will load faster!
<a href="https://dotlayer.com/what-is-migrate-js-why-and-how-to-remove-jquery-migrate-from-wordpress/" rel="nofollow ugc">Read our article about jQuery Migrate and Website Optimization</a>.

Remove jQuery Migrate Safely

Completely removes the jQuery migrate script dependency safely from your WordPress website thereby improving page load speed on the frontend.

Hendy Tan

This plugin removes jQuery Migrate script (jquery-migrate.min.js or jquery-migrate.js) from your WordPress site’s <a href="https://wordpress.org/documentation/article/wordpress-glossary/#front-end" rel="ugc">front end</a> when the plugin is active. To bring back the removed jQuery Migrate script, simply deactivate this plugin.
To check whether jQuery Migrate is required in the front end, you could use the development version of jQuery Migrate (unminified version) by temporarily turning on <a href="https://wordpress.org/documentation/article/debugging-in-wordpress/#script_debug" rel="ugc">SCRIPT_DEBUG</a> mode in wp-config.php file. The development version shows warnings in the browser console when removed and/or deprecated jQuery APIs are used.
For more info about jQuery Migrate, visit <a href="https://github.com/jquery/jquery-migrate#readme" rel="nofollow ugc">here</a>.
GitHub: <a href="https://github.com/icaru12/remove-jquery-migrate" rel="nofollow ugc">https://github.com/icaru12/remove-jquery-migrate</a>

Remove jQuery Migrate

A very lightweight plugin that removes jQuery Migrate script from your WordPress site's front end.

Remove jQuery Migrate Safely vs Remove jQuery Migrate