org-babel-tangle is really really slow

[Luis-Henriquez-Perez]

I have a large org file, but still org-babel-tangle-file is so slow, it made my emacs freeze--twice! Sigh...With this experience I don't even feel comfortable recommending the user call tangld-build interactively. We may have to roll out our own tangle function--less features, but at least works and is fast. I've written a tangling function before using re-search-forward to collect source blocks and it was infinitely faster than org's. We may also need to consider asynchronous tangling.

[Luis-Henriquez-Perez]

I am thinking we need to include async as a dependency. org-babel-tangle-file is slow for tangling just one file. People have much more than one dotfile. So doing it synchronously might make them wait a while, which is a no-go.

I also really really want to include loopy. But this is more of for my own preference.

[aldrichtr]

I have not experienced that, but if there are performance issues with org-babel-tangle-file, then we should definitely consider rolling something else. I think that async and parallel tangling is a great idea as well.

[Luis-Henriquez-Perez]

I have not experienced that
It happens with large org files. I have one org file that holds almost of all of my config. I think that's why I experienced freezing.

if there are performance issues with org-babel-tangle-file, then we should definitely consider rolling something else.

Definitely. Its safe to assume a good portion of the users for this package will have either many org files or large org files. Right now it's not the highest priority, but I think rolling out a different (faster) implementation is a must.

I think that async and parallel tangling is a great idea as well.

Right now that's how I do the tangling but I should probably make it an option. So the user can choose between synchronous/asynchronous tangling. One problem with async tangling though is I don't know how reliable it is to use tangle-install afterwards we can't guarantee all the tangling will be done after the tangld-build function call.