Run results for: Math.random() vs. random() v2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36

Browser: Chrome 125

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

random()

9.5M/s

Math.random()

6.9M/s

View exact numbers

Test name	Executions per second
✓ random()	9,486,525 Ops/sec
Math.random()	6,909,006 Ops/sec

Script Preparation code:

var random = (() => {
    const MAX = 2 ** 32 - 1;
    const pool = crypto.getRandomValues(new Uint32Array(1024)); // 4MB
    let index = 0;

    return () => {
        const value = pool[index];
        index++;
        if (index === pool.length) {
            crypto.getRandomValues(pool);
            index = 0;
        }
        return value / MAX;
    };
})();

Tests:

Math.random()
Math.random()
random()
random()