Run results for: copyWithin: is it fast in Uint32Array

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4 Safari/605.1.15

Browser: Safari 17

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

UInt32Array copyWithin

9.3M/s

UInt32Array Iteration copy

38K/s

View exact numbers

Test name	Executions per second
✓ UInt32Array copyWithin	9,300,636 Ops/sec
UInt32Array Iteration copy	37,550 Ops/sec

Script Preparation code:

var buffer = new Uint32Array(1024*1024);
for(var i=0; i< buffer.length; i++) {
    buffer[i] = Math.round(Math.random() * 256);                          
}

Tests:

UInt32Array Iteration copy
var start = 100; var length = 200; var copyToPos = 1000; for(var i=0; i< length; i++) { buffer[copyToPos++] = buffer[start + i] }
UInt32Array copyWithin
var start = 100; var length = 200; var copyToPos = 1000; buffer.copyWithin(copyToPos, start, start + length);

Run results for: copyWithin: is it fast in Uint32Array

Comparing the performance between iteration and copyWithin in Uint32Array

UInt32Array Iteration copy

UInt32Array copyWithin