Slower than JSON.parse

[dalisoft]

Hi @luizperes

I know this library was made to handle large JSON files, but there i occurred to some performance stranges when tried to parse my json and benchmarked, this library is slow, up to 6-x slower.

Here result:

json.parse - large: 985.011ms
simdjson - large: 4.756s

Also, lazyParse does not return expected result for me or i'm doing something wrong, and even using lazyParse, performance still slow. How we can improve this?

Code to test

const simdJson = require("simdjson");

const bench = (name, fn) => {
  console.time(name);
  for (let i = 0; i < 200000; i++) {
    fn();
  }
  console.timeEnd(name);
};

// Create large JSON file
let JSON_BUFF_LARGE = {};
for (let i = 0; i < 20; i++) { // 20 is close to 0.5Kb which very small, but you can increase this value
  JSON_BUFF_LARGE["key_" + i] = Math.round(Math.random() * 1e16).toString(16);
}
JSON_BUFF_LARGE = JSON.stringify(JSON_BUFF_LARGE);

console.log(
  "JSON buffer LARGE size is ",
  parseFloat(JSON_BUFF_LARGE.length / 1024).toFixed(2),
  "Kb"
);

bench("json.parse - large", () => JSON.parse(JSON_BUFF_LARGE));
bench("simdjson - large", () => simdJson.parse(JSON_BUFF_LARGE));