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It's not about disk, it's about network I/O. Making your resource "more unique" means more cache misses and more requests that need to be served (in theory anyway, see Klathmon's sibling comment[0] for more on this).

[0]: https://news.ycombinator.com/item?id=13138826




Not being a fan of used shared CDNs for static resources[1], I don't see the issue here. They're going to have to download something anyway so from the perspective of your users it's still one download, just smaller. With proper unique namespacing (unique URL per version) and HTTP Cache-Control headers, they only have to download it once (assuming they don't clear their local cache).

[1]: Combination of security reasons and unnecessarily coupling apps to the public internet.




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