trying to import doesn't work:

import should work
cannot import
none observed
unsure. it happened during all imports, but then I cleared my KOLIBRI_HOME folder and things started working again
0.13.0 alpha 3
I tried clearing my entire DB and content, and things started working again.
This is a new class of bug to me. The task seems to finish immediately, but doesn't transfer any files.
Other things I've seen
That's exactly what was happening on #6049, see my comment. @rtibbles said he had an inkling what was the issue, but is in the air atm probably...
Yes, this was not a performance improvement, but rather a bug induced by including the importability annotation in the content import task that I had not yet resolved on the above PR, will fix ASAP.
sorry for merging the PR before it was ready!