为什么 console.time 显示的时间比实际时间短得多？

Question

I am testing a snippet of JavaScript's speed using the console.time(); method in Chrome and Chromium-based Edge. When I'm running the snippet in the browser, it takes at least 2 seconds, but the displayed result of time is around milliseconds, What is happening here?

 var list = [...Array(50000000).keys()]; console.time("time"); var x = 0; for (let i = 0, n= list.length; i<n;i++) { x++; } console.timeEnd("time");

I've tested this with performance.now() and I get the same result as time , which is really confusing however it works perfectly fine in Firefox.
Is this a Chrome/Edge bug? if it is, How can one submit an issue for chrome?

Update

Thanks to @vlaz and @Jax-p I found out that I've missed the array generation time :

 console.time("time");
    var list = [...Array(50000000).keys()];

    var x = 0;
    for (let i = 0, n= list.length;   i<n ;i++) {
      x++;
    }
    console.timeEnd("time");

Answer 1

Creating and spearding array with [...Array(50000000).keys()];takes over 1.5s in my Chrome but you have timer start after that (You had. Before you change the question.) . I am getting same (a little bit higher) results in Firefox. Can it be it?

Suppose there is also a delay before the browser even gets to execute JavaScript.

 console.time("time"); var list = [...Array(50000000).keys()]; console.timeEnd("time"); console.time("time2"); var x = 0; for (let i = 0, n= list.length; i<n;i++) { x++; } console.timeEnd("time2");