Hi Ihor,

> 1. Plenty of valid warnings and one of third-party packages broken when
>    using the branch [*]

Thanks for highlighting these, I’m gradually going through them.

> 2. I had to (require ’org-latex-preview). `org-latex-preview’ is not
>    autoloaded for some reason.

I haven’t had that issue, so I’m guessing it’s something to do with how your
autoloads were built.

> 3. It took 20+ seconds (!!!) to generate previews in a single section in
>    my large notes.org. Profile attached - org-latex-preview parses the
>    whole 20Mb buffer to generate the preamble. Why?

Because of the use of buffer info in generating the preamble, which calls
`org-export--annotate-info'. I’m currently considering introducing a variable to
allow for the use of buffer-specific info to be toggled.

> 4. Triangle symbols do not disappear if I C-g in the middle of
>    generating the preamble.

Hmm, we haven’t really considered the preamble generation being interrupted.

> 5. Why triangles? Something resembling “waiting” would be more
>    meaningful.

It has to be a small icon, so that basically means simple geometric shapes only.
There’s also the “grey text” indicator, and “no indicator” option.

> 6. What will happen if I add/remove #+LATEX_HEADER in the buffer? in
>    subtree properties? Are in-buffer latex settings supposed to affect
>    anything? I tried to add #+LATEX_HEADER on top of the file, but the
>    preview do not appear to be re-generated.

Currently you need to set `org-latex-preview--preamble-content' to nil, which
currently can be done by doing `C-c C-c' on the header / otherwise running
`org-restart'.

All the best,
Timothy

-- 
Timothy (‘tecosaur’/‘TEC’), Org mode contributor.
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/tec>.