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So this got 3 downvotes, and I don't care about the karma, but I'd be quite curious to hear about opposing experiences scaling up Clojure programs since there seems to be some disagreement.

If you started to struggle with fitting everything in one node due to CPU or memory constraints, but still felt like you were writing Clojure in a half way idiomatic style when moving to a cluster, I'd love to hear from you.

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~10X a performance penalty doesn't seem that bad. In C a pointer derefference will beat a web service call by more than 10X. Also why a handjammed KV store? EDN and other(faster) serialization libraries have been around for quite a while.

I used nippy originally, then later Java serialization libraries once it became clear optimization was required. I tried using both Redis and RocksDB. The happy case had all but the last layer of nodes sitting in cache in memory (as long as your memory is more than 1/32 of the size of your disk).

I think I could do better starting from scratch given what I've learned.

That’s just what happens around here when you imply that a Lisp might not be perfect.

Don’t think to hard about it, they don’t either.

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