Run results for: localStorage vs sessionStorage vs Reading a Hardcoded Array Speedtest

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 14_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/91.0.4472.80 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 91

Operating system: iOS 14.6

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
Control	449933400.0 Ops/sec
localStorage	5784780.0 Ops/sec
sessionStorage	5945988.0 Ops/sec
Read Array	4348058.0 Ops/sec

Script Preparation code:

localStorage.setItem('foo', 'bar')
sessionStorage.setItem('foo', 'bar')
var ARR = ['bar'];

Tests:

Control
var FOO = 'bar';
localStorage
var FOO = localStorage.getItem('foo');
sessionStorage
var FOO = sessionStorage.getItem('foo');
Read Array
var FOO = ARR[Math.floor(Math.random() * ARR.length)]

Run results for: localStorage vs sessionStorage vs Reading a Hardcoded Array Speedtest

Control

localStorage

sessionStorage

Read Array