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Tried updating test.check version to latest, but it seems like the map generator has gotten slower from version 0.5.9 up. I tried to make this easy to reproduce in the git repo below, but please let me know if you'd like more information/can't reproduce. Thanks!
https://github.com/brainkim/testcheckperf

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Comment made by: reiddraper

Thanks Brian. I'm still digging in to this, but it's appearing like the performance regression is in keyword generation, not map generation. There was also a major change to keywords between 0.5.8 and 0.5.9 in (link: https://github.com/clojure/test.check/commit/4528b5ed391d6127b79f4db6bc5e086613da0d81 text: 4528b5ed391d6127b79f4db6bc5e086613da0d81).

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Reference: https://clojure.atlassian.net/browse/TCHECK-57 (reported by brainkim)
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