Run results for: Dataview vs Custom - Read uint32

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:55.0) Gecko/20100101 Firefox/55.0

Browser: Firefox 55

Operating system: Windows

Device Platform: Other

Date tested: 6 years ago

Test name	Executions per second
Dataview	4.3 Ops/sec
Custom	6.1 Ops/sec

Script Preparation code:

    var totalValues = 1024 * 1024;
	var valueSize = 4;
	var totalBytes = totalValues * valueSize;
	var buffer = new ArrayBuffer(totalBytes);
	// fill
	var dv = new DataView(buffer);
	for (i=0; i<totalBytes; i+=valueSize) {
	   num = Math.floor(Math.random()*Math.pow(2,8*valueSize));
	   dv.setUint32(i,num,true);
	}
	
	function readUnsignedInt(stream){
		var l=stream[seek]+stream[seek+1]*256+stream[seek+2]*65536+stream[seek+3]*16777216;
		seek=seek+4;
		return l;
	}
	
	var seek=0;
	var stream = new Uint8Array(buffer);

Tests:

Dataview
for (i=0; i<totalBytes; i+=valueSize) { num = dv.getUint32(i,true); }
Custom
for (i=0; i<totalBytes; i+=valueSize) { num = readUnsignedInt(stream); }
Basecase - Just loop
for (i=0; i<totalBytes; i+=valueSize) { }

Run results for: Dataview vs Custom - Read uint32

Dataview

Custom

Basecase - Just loop