Rule from network under performance category
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Caching allows the user's browser to keep a local copy of a resource for fast loading without downloading the entire resource from the server every time.
This issue refers to a external resource that does not have caching headers defined which makes caching on the users' browser unpredictable.
We advise contacting the remote vendor and showing them the information as to the benifits that will be gained by having complete control of how long a resource is cached at passmarked.com/performance/network/missing-cache-headers-on-local-asset which will also guide as to how this can be enabled.
Using a popular CDN is a great way to improve your chance that a user will already have the resource cached as they might have seen it before on another site.
Well known CDN's include:
These targets have proper caching headers set and ready for us.
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