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

Run details:

User agent: Mozilla/5.0 (Windows NT 5.1; rv:52.0) Gecko/20100101 Firefox/52.0

Browser: Firefox 52

Operating system: Windows XP

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Math.random()	185686592.0 Ops/sec
random()	10589471.0 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()