We are facing the same issue here. All of a sudden our flexible content fields within the ACF admin are now almost unworkable and have started to time out the browsers and also its timing out trying to upload or save json files as well.
We have tried everything including loading from PHP and also using Redis to see if that helps but all have failed. The only one that seems to make a small difference is adding the following to the functions.php:
//Disable ACF field group settings
add_filter( ‘acf/field_group/disable_field_settings_tabs’, ‘__return_true’ );
Any help would be greatly appreciated.
