On Jan 11, 2019, at 4:49 AM, Simon Peyton Jones <simonpj@microsoft.com> wrote:

When I try that, it starts by displaying the code from the file. No rotating circles or anything. But if I wait ten seconds, suddenly the comments appear. So:
rendering seems terribly slow
there is no indication that it is incomplete

Maybe you just weren’t waiting long enough?

I had a similar experience (with comments coming later, and with no indication that I should wait), but then the comments were incomplete when they did appear, including only your new comment, not the older one.