with the first example on https://www.json.org/example.html and the following Julia code

using JSON3

data = JSON3.read("test.json")

println(data[:glossary][:title])

running `time julia +release --project=. --startup-file=no test.jl` gives a total time spend of 0.39 seconds (running on a dev version of Julia brings it down to 0.30). The translation of this into python is faster (.02 seconds), but this means that as long as your script has at least a second or so of work to do, Julia will be faster.