How can I speed up json parsing?

Question

JavaScript

I have a price.json file (897 KB) that is steaming:

var values = [11,694];
    var t0 = performance.now();
    var myInit = {
      method: 'GET',
      headers: {
        'Content-Type':'application/json' 
      },
      mode: 'cors',
      cache: 'default'
    };
    let myRequest = new Request("price.json",myInit);
    (async () => { fetch(myRequest)
        .then(function(resp){
          return resp.json();
        })
        .then(function(data){
          console.log(data);
          for (let i = 0; i < document.getElementsByName('js-price').length; i++) {
            document.getElementsByName('js-price')[i].innerHTML = "$" + Number(data[values[i]]['lastPrice']).toFixed(2); //694
            document.getElementsByName('js-price-percent')[i].innerHTML = Number(data[values[i]]['priceChangePercent']).toFixed(2); //694
            
          }
          console.log(`Время закгрузки JSON ${(performance.now() - t0).toFixed(2)}`); 
        })
      })();

On average, it takes 89ms, which is a very long time, can I somehow speed up the parsing time?

Answer 1

897kb is
almost a megabyte to download! I don’t believe that this happens with your Internet in 80 milliseconds, rather, everything from the cache is taken
for json parsing, it just takes a few tens of milliseconds, and it’s unrealistically fast for a megabyte
ps file in c ++ there is a simdjson parser, it parses ten times faster, but it does this not in memory, but by tokens, right in the process of analyzing the result, there is something like, get the next token, look at its type, name and either skip (including objects) or recursively work with the object
the browser does not know how, in theory, you can try to write such a parser in javascript, but I don’t believe that it will be faster
upd: https://www.npmjs.com/package/simdjson