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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser: Chrome 128

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Math.random()	13834828.0 Ops/sec
random()	22663524.0 Ops/sec

Script Preparation code:

class EntropyPool {
    #entropy; #index
    constructor(poolSize = 1024) {
        this.#entropy = new Uint32Array(poolSize)
        this.#index = 0
        crypto.getRandomValues(this.#entropy)
    }
    next() {
        const value = this.#entropy[this.#index++]
        if (this.#index === this.#entropy.length) {
            crypto.getRandomValues(this.#entropy)
            this.#index = 0
        }
        return value
    }
}

const pool = new EntropyPool()

function random() {
    return pool.next() / 4294967296
}

Tests:

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