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There is no absolutely "better" algorithm in caching. Depends on the usage pattern of the user. We believe LRU is very simple, predictable and works well for most use cases, so it's a good default . It is unrelated to the fact that the Redis LFU implementation is good or not. Your argument is not valid to justify you misrepresented Redis abilities in the post.

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I did not claim that DrashCache is "the absolutely best" algorithm. But some caching algorithms could be better than others on real-world data.

Would you want me to run something like https://github.com/twitter/cache-trace on both Redis/(LRU,LFU) and Dragonfly and see which one has higher hit-rate for the same memory requirements? Would this be a good test to decide if Dragonfly improves on Redis caching quality?

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