Ignore JavaScripts

Last updated Apr 17, 2026 You can have Rocket Loader ignore individual scripts by adding the data-cfasync="false" attribute to the relevant script tag:

<script data-cfasync="false" src="/javascript.js"></script>

Rocket Loader will still optimize the loading of all other scripts on the page.

Note

If Rocket Loader is only impacting a specific page, use a Configuration Rule to exclude that page by URL.

Limitations

  • Adding this attribute within JavaScript will not work if you wish to exclude the script from Rocket Loader.
  • If the script you want Rocket Loader to ignore has dependency on other JavaScript(s) on the page, those dependencies must also have the data-cfasync="false" attribute.
  • The data-cfasync attribute must be added before the src attribute.
  • Rocket Loader will recognize the tag when either single or double quotes are placed around the attribute value.

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description: Shared dictionaries reduce repeat-visitor transfer size by compressing each response against a version the browser already has cached. title: Shared dictionaries image: https://developers.cloudflare.com/speed/optimization/content/shared-dictionaries/og.png?v=52503ae4d2af2d59

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