Drupal Association members fund grants that make connections all over the world.
At the top of the page where you add a taxonomy queue (the Smart Queue Taxonomy module needs to be enabled for this), there's the following:
(...) Using this with large or too many taxonomies may degrade performance.
What (number) is meant by 'large' or 'too many'? Did people experience problems with this? If so, at how many vocabularies/terms?