Run results for: Object freeze vs normal obj access

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36

Browser: Chrome 136

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

No freeze

1.0M/s

Freeze

196K/s

View exact numbers

Test name	Executions per second
✓ No freeze	1,027,488 Ops/sec
Freeze	195,797 Ops/sec

Script Preparation code:

const baseObj = { ...[ Array.from({ length: 1000 }, () => Math.random().toString(16).slice(2)) ] }

var obj = Object.assign({}, baseObj);
var frozen = Object.freeze(Object.assign({}, baseObj));

Tests:

Freeze
for (let i = 0; i < 1000; i++) { frozen[i] }
No freeze
for (let i = 0; i < 1000; i++) { obj[i] }