v6.9.1

• New: Some data used for field settings is now stored in memory and reused in order to significantly improve performance in the form builder for forms with a lot of fields.
• Fix: Rootline and progress bar elements would not appear when using some position settings with the new submit button field.
• Fix: An invalid argument supplied for foreach() error has been fixed when truncating unexpected values.
• Fix: Submit button fields were appearing by mistake in WooCommerce products.
• The parser for serialized string data has been optimized to be approximately 30% faster than before.
• Some old deprecated code has been removed including the FrmPointers and FrmDbDeprecated classes, FrmAppHelper::sanitize_array, FrmAppHelper::expiring_message, and several methods in FrmEntryValidate.php.
• Old polyfill code for supporting old versions of Internet Explorer have been removed from front end JS, reducing file size.