Performance

Problem:
The client is experiencing performance issues due to the 'wpml-scanning-files-hashing' option in the wp_options table being extremely large (over 1MB) and set to autoload, impacting site performance.
Solution:
This option stores hashes of files related to active themes and plugins to detect changes during the Theme and Plugin Localization scan. It is generally safe to delete or reset this option, and WPML will regenerate it during the next scan under WPML → Theme and Plugin Localization. Disabling autoload for this option by setting autoload='no' should not affect WPML's functionality, although it may revert to autoload after a new scan. If the issue persists or if the size grows significantly again, we recommend opening a new support ticket. For further assistance, please check related known issues at https://wpml.org/known-issues/, verify the version of the permanent fix, and confirm that you have installed the latest versions of themes and plugins. If this solution does not apply to your case, please open a new support ticket at WPML support forum.

Problem:
You are experiencing 504 Gateway Timeouts and significant performance degradation due to increased internal calls to

get_field_groups_by_object_type

after updating WPML and ACF Pro plugins. This issue is linked to how ACFML handles field group translations, especially during REST API requests.
Solution:
We recommend using the

acfml_should_translate_acf_entity

filter introduced in ACFML version 2.1.4 to selectively disable translation logic during REST API requests. Here is how you can implement it:

add_action( 'rest_api_init', function() {
    if ( wp_is_serving_rest_request() ) {
        add_filter( 'acfml_should_translate_acf_entity', '__return_false' );
    }
}, 5 );

It is advisable to add this snippet in a Must-Use plugin for optimal performance.
For more details, refer to the official documentation: ACFML filter documentation, and the release notes: ACFML 2.1.4 release.

If this solution does not resolve your issue or seems outdated, please check related known issues at https://wpml.org/known-issues/, verify the version of the permanent fix, and confirm that you have installed the latest versions of themes and plugins. If the problem persists, we highly recommend opening a new support ticket for further assistance.