on my macbook, it seems to be 16ms + 16ms = 32ms to write & read a 2M JSON file with jsonista.

(let [file (io/file "data.json")
      data (cheshire/parse-string (slurp "json2m.json"))]
  (cc/quick-bench
    (do (j/write-value file data)
        (j/read-value file))))