Run results for: Math.random vs crypto.getRandom sizes

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.87 Safari/537.36

Browser: Chrome 80

Operating system: Mac OS X 10.15.3

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Math.random()	6406022.0 Ops/sec
crypto.getRandomValues()	166879.5 Ops/sec
crypto.getRandomValues() UINT	177067.7 Ops/sec
crypto.getRandomValues() UINT8	169588.5 Ops/sec

Tests:

Math.random()
Math.random()
crypto.getRandomValues()
crypto.getRandomValues(new Uint32Array(1))[0] / 4294967296
crypto.getRandomValues() UINT
crypto.getRandomValues(new Int32Array(1))[0] / 4294967296
crypto.getRandomValues() UINT8
crypto.getRandomValues(new Uint8Array(1))[0] / 4294967296