Use a CDN


Some files such as the JavaScript libraries, CSS style sheets and images consume lots of network resources because there are lots of them and they are usually small. CDNs (Content Delivery Network) are thus recommended as they bring the files physically closer to users, saving large amounts of bandwidth and improving response time.

Use the CDNs provided by Google which host the most popular JavaScript libraries.

This best practice should only be applied if it is coherent with your project's specifications.
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