Run results for: Immutable vs Native

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3462.0 Safari/537.36

Browser: Chrome 69

Operating system: Windows

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
native copy	159.8 Ops/sec
immutable copy	1290065.9 Ops/sec

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/immutable/3.8.1/immutable.min.js"></script>

Script Preparation code:

var native = [];
for (var i=0; i < 1000000; i++) {
  native.push(i);
}
var imm = Immutable.List(native);

Tests: