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The latest report on Rossi's device actually contains clear evidence that the experimental set-up has been tampered with. On page 14 it says:

  "Measurements performed during the dummy run with the PCE and ammeter clamps allowed us to measure an average current, for each of the three C_1 cables, of I_1 = 19.7A, and, for each C_2 cable, a current of I_1/2 = I_2 = 9.85 A."

Here, I_1 and I_2 are the line and phase currents of a set of delta-connected resistive load inside the "reactor". The ratio between these currents should therefore be sqrt(3) (approximately 1.73). Since the measured ratio is 2, the curcuit diagram cannot correspond to reality. The reactor probably contains two separate sets of star-connected resistors instead. By feeding current to the second set out of phase with the first, like I suggested in a previous slashdot comment, the current clamps are fooled into giving a too low measurement.

This document (in Swedish) explains it all in detail.

The fact that these measurements were performed and reported also implies that the authors of the report were not part of the fraud. Rossi simply fooled them all.

https://www.writelatex.com/ and https://www.sharelatex.com/ and several desktop latex editors seems to work OK despite your logic.

The main appleal of LaTeX is precisely that you aren't supposed to continuously re-render it, you are supposed to write things. Then you twiddle how it looks a bit at the end.

Optimizing web pages for speed of rendering the output seems reasonable, but I'm not sure that should be a big consideration in a document format.

Two good options I'm surprised that haven't been mentioned are sharelatex https://www.sharelatex.com/ and a former rival (now subsumed into sharelatex) scribtex https://scribtex.com/ Both are a "Google Docs meets LaTeX" solution that work well for various settings. I've had good luck using them with student collaborators who may not want to learn all the ins and outs of LaTeX for a joint project but who can edit text, draw figures, etc. and learn at least some of LaTeX without just starting with a blank page. They work well with the main features being that they are TeX-aware and the collaborators can just edit online and then typeset to PDF online without having to install TeX, style files, BibTeX, various graphics packages etc. on their own machines. The "diff" capability and the "revert to version of July 15" features are great when working with less-than-expert-LaTeXers as there are inevitable screwups and it has served me well both for writing academic papers with students and for collaborating on research grant proposals with people who give blank stares when the word "github" comes up. It is a great improvement over the "one author has the token and people email each other the latest version" method that is quite common and usually results in a couple of screwups along the way.

Or sharelatex.

https://www.sharelatex.com/

https://www.sharelatex.com/

While the summary makes it sound like this is some breakthrough idea, there are several similar sites out there:

https://www.sharelatex.com/

http://spandex.io/

And others, I'm sure. Is the submitter the owner of this particular version? The marketing speak is a bit over-the-top.

I used sharelatex for a group project last semester and it worked fine. Several features were added since then that make it likely I'll use it again.