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We should also be asking if the benefits of a non-partitioned cache are truly there in the first place. I think the main claim is that if (for example) the same JS library is on a CDN and used across multiple sites, your browser only has to cache it once. But how often does this really happen in practice?

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In the days of jQuery… all the time.

In the days of webpack, not so much.

Well I know it's not directly the answer to your question, but the article mentions that in practice a partitioned cache increases bandwidth by 4%. Which at the scale of billions of web browsers is actually pretty bad.

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