Avoid loading all taxonomy terms on taxonomy term edit page for very large vocabularies

This sounds familiar.

Yes, I found it, I think this was fixed in 🐛 Avoid loading all terms on the taxonomy overview form Needs work . That was committed to 10.2.x. And this is for Drupal 10.0, which is no longer receiving support. Can you upgrade to a supported version?

Changing to a support request.

Thanks for looking into this! I've changed the ticket's Version to 10.3.x0-dev because the impacted site is using 10.3.10. I still experience the same 4-5 minute load time delay for a taxonomy term page to become editable, since all the terms are being loaded into the Relations section of the edit page. I'm currently looking into potential patches to address.

As a temp fix we disabled the parent selector form in a custom module:

/**
 * Implements hook_form_FORM_ID_alter().
 */
function taxonomy_fix_form_taxonomy_term_form_alter(&$form, FormStateInterface $form_state): void {
  $form['relations']['parent']['#access'] = FALSE;
}

In addition to @parkerc #7 solution. If you see TermForm.php around line 37 it seems to be known that this could be the case. There is a comment there:

    // \Drupal\taxonomy\TermStorageInterface::loadTree() and
    // \Drupal\taxonomy\TermStorageInterface::loadParents() may contain large
    // numbers of items so we check for taxonomy.settings:override_selector
    // before loading the full vocabulary. Contrib modules can then intercept
    // before hook_form_alter to provide scalable alternatives.

you can manually change the override_selector setting in taxonomy.settings.yml as well instead of a form alter.

The code indicates not loading the full entity for each term.

So this issue could maybe be considered not a core issue and more of a problem to solve with a module since the use case is potentially unique to have a monstrous amount of terms.

thoughts?

I wonder if instead of a select it could be an autocomplete entity reference field.