Run results for: Array vs Float32Array vs Float64Array multiplication

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Plain array

22K/s

Float64 Array

2K/s

Float32 Array

2K/s

View exact numbers

Test name	Executions per second
✓ Plain array	21,559 Ops/sec
Float64 Array	1,576 Ops/sec
Float32 Array	1,571 Ops/sec

Script Preparation code:

const len = 16384;
window.len = len;
window.arr = new Array(len);
window.f32 = new Float32Array(len);
window.f64 = new Float64Array(len);
for (let i = 0; i < len; i++) {
  window.arr[i] = Math.random() * 2048;
  window.f32 = Math.fround(window.arr[i]);
  window.f64 = window.arr[i];
}

Tests:

Plain array
let a = 0; for (let i = 1; i < window.len; i++) { a = window.arr[i] * window.arr[i - 1]; }
Float32 Array
let a = 0; for (let i = 1; i < window.len; i++) { a = window.f32[i] * window.f32[i - 1]; }
Float64 Array
let a = 0; for (let i = 1; i < window.len; i++) { a = window.f64[i] * window.f64[i - 1]; }