Re: Any examples of web sites currently using this revised version?
To answer my own question, there's a test script on the Coin Hive web site. Using the default two threads it take about 60% of my CPU capacity. On my overclocked i5 that just tweaks the cooling fan up by a few hundred RPM, enough to notice, not enough to materially intrude. Using just one thread halves the number of hashes, but is barely noticeable. Interestingly the default 2 thread setting is sufficiently obvious that it tells me which other less reputable web sites are already using this or similar. In terms of interference with other tasks, very little - with several tabs open I could watch Youtube vids without interruption, piffle about here, and so forth. If you were gaming, compiling or doing other heavy lifting then you would either notice the load or need to reduce the number of threads - even then it might be too difficult. YMMV, particularly if your PC fans are noisy.
So on that basis, it works, isn't a problem on my machine and I'd tolerate it for access to decent content, with the important proviso that I wouldn't allow mining on my CPU and put up with adverts as well. It's either or.
What's this worth to the content provider? Well in ten minutes my CPU created 17,500 hashes. From Coin Hive we have:
(<solved_hashes>/30286051346) * 6.19 XMR * 0.7= 0.000143 XMR per 1M hashes
As each XMR is worth about $88, that means that 10 minutes on the Reg would earn them 2.2 US cents. If I visit the Reg for twelve minutes on 240 days per year, then they make $6.34, for half that or single thread mining, they make $3.17. From previous guesstimating, it looks as though unique users generated about 30p per year for Situation Publishing. If I assume they've lifted that to 40p per reader per year (53c), the break even point for mining would be an accumulated viewing time of 240 minutes per year, or about one minute per working day. Potentially the Reg could make more money, pay for more journalism, and not have the internal conflict inherent in "biting the hand that feeds it".
Would somebody like to check my maths out? And you might want to try running the Coin Hive script on some different machines, see how that works out?