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Have you looked into using something like SQLite instead of the filesystem? [1]

[1] https://www.sqlite.org/fasterthanfs.html

SQLite makes a ton of sense for systems that don't need to worry about concurrent writes. It's possible that a CDN's cache system might need to concern itself with concurrent writes.

Other than the concurrent write that another comment mentioned, looks like this test is done with a data set that fits entirely in RAM. I wish we have enough RAM for the entire internet :-(

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