Version 2.3.2 contains two significant performance improvements for the product list. They should benefit all of the existing Isotope setups as the improvements involve the category filtering process.
In addition to this, the template function
$this->generateAttribute('field_name'); for option fields (select, checkboxes, options manager) has been adjusted so that it does not necessarily only generate an html list or table but can also easily be customized. By using
$this->generateAttribute('field_name', ['noHtml' => true]); you get a key-value array which you can then be used again at one's direction.
A big thank you to the Circle members for some of the bug fixes.