Run results for: Dataview vs Custom - Read uint8

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36

Browser: Chrome 66

Operating system: Windows 7

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Dataview	2.7 Ops/sec
Custom	1.5 Ops/sec
Basecase - Just loop	14.7 Ops/sec

Script Preparation code:

  var totalBytes = 1024 * 1024;
  var buffer = new ArrayBuffer(totalBytes);
  // fill
  var dv = new DataView(buffer);
  for (i=0; i<totalBytes; i++) {
  	 num = Math.floor(Math.random()*256);
  	 dv.setUint8(i,num,true);
  }
  
  function readUnsignedByte(stream){
         var l=stream[seek];
         seek=seek+1;return l;
  }
  	
  var seek=0;
  var stream = new Uint8Array(buffer);

Tests:

Dataview
for (i=0; i<totalBytes; i++) { num = dv.getUint8(i); }
Custom
for (i=0; i<totalBytes; i++) { num = readUnsignedByte(stream); }
Basecase - Just loop
for (i=0; i<totalBytes; i++) { }

Run results for: Dataview vs Custom - Read uint8

Dataview

Custom

Basecase - Just loop