OP referred to Web Workers[1] which do allow real parallel number crunching (at minimum on a different thread, might even be in a different core). It's a somew

OP referred to Web Workers[1] which do allow real parallel number crunching (at minimum on a different thread, might even be in a different core). It's a somewhat "new" feature of JavaScript but most modern browsers already implement it[2]. [1] https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers... [2] http://caniuse.com/#search=webworkers http://caniuse.com/#search=webworkers