Run results for: Dataview vs Uint8Array - read byte+

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0

Browser: Firefox 69

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
DataView	11904.8 Ops/sec
Uint8Array	23088.4 Ops/sec

Script Preparation code:

var size = 1024;
var buffer = new ArrayBuffer(size);
var bytes = new Uint8Array(buffer);
var dv = new DataView(buffer);
var dvRes = 0; //make sure results aren't thrown away by v8
var uRes = 0; //make sure results aren't thrown away by v8

for (var i = 0; i < size; i++)
  dv.setUint8(i, Math.ceil(Math.random() * 255));

Tests:

DataView
for (var i = 0; i < size; i++) dvRes += ~dv.getUint8(i);
Uint8Array
for (var i = 0; i < size; i++) uRes += ~bytes[i];