Run results for: Math.random vs crypto.getRandomValues 32 bytes

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:104.0) Gecko/20100101 Firefox/104.0

Browser: Firefox 104

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Math.random	6594125.5 Ops/sec
crypto API	526904.4 Ops/sec

Script Preparation code:

u8 = new Uint8Array(32)

Tests:

Math.random
for(let i=0;i<u8.length;++i) { u8[i] = Math.round(Math.random() * 0xff) }
crypto API
crypto.getRandomValues(u8)