Run results for: copy ArrayBuffer: Uint8Array.set vs by bytes

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36 Edg/126.0.0.0

Browser: Chrome 126

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Uint8Array by byte

8.1M/s

Uint8Array with set

490K/s

View exact numbers

Test name	Executions per second
✓ Uint8Array by byte	8,064,156 Ops/sec
Uint8Array with set	489,675 Ops/sec

Script Preparation code:

var size = 0xFFFF;

var source = new Uint8Array(size);
var target = new Uint8Array(size);

for (let i = 0; i < size; i++) {
	source[i] = 100*Math.random();
}

Tests:

Uint8Array by byte
for (let i; i < size; i++) { target[i] = source[i]; }
Uint8Array with set
target.set(source);