Wow! I would really like to be a miner, seems promising.

Units:

iPhone 6
iOS 11
Safari, Firefox, Google Chrome

iPad 4
iOS 10
Safari, Firefox, Google Chrome

*edit

Throwing in the following unit as well:

MacBook Pro
i7 2,4 GHz
8 GB RAM
Intel HD Graphics 3000 512 MB
OS X 10.11.5
Safari, Chrome, Firefox