In regards to taking up an entire core, it's updating as fast as it possibly can, it's basically a stress test. In practice, updating this quickly isn't useful, you would want to throttle it for production use.
It's reasonably quick on an iPhone 6 (though obviously slower than on a desktop). In actual use you'd obviously design things a bit differently. Again, this is a performance test, not a real application.
It's reasonably quick on an iPhone 6 (though obviously slower than on a desktop). In actual use you'd obviously design things a bit differently. Again, this is a performance test, not a real application.