This reminds me of another thread, where performance issues related to
concurrent allocation were explored in depth:
https://groups.google.com/d/topic/clojure/48W2eff3caU/discussion
The main takeaway for me was, that Hotspot will slow down pretty
dramatically, as soon as there are two threads allocating.

Could you try:

a) how performance develops, when you take out the allocation (assoc)
b) if increasing Hotspot's TLAB size will make any difference?
​

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