Selecting many relationships taxes forever (more efficient way)??

Hello,

Thank you for your feedback.

Currently, MB relationship select box only supports selecting one object per selection. You can add more objects and it also supports searching for objects with the default field type select_advanced.

Hello,

I will inform the development team to consider supporting this feature for the relationship selection. Thanks.

Additionally, you can use the field type checkbox_list to select more posts. For example:

MB_Relationships_API::register( [
    'id'   => 'job-to-post',
    'from' => [
        'object_type'  => 'post',
        'post_type'    => 'my-job',    
        'field' => [
            'field_type' => 'select'
        ]    
    ],
    'to'   => [
        'object_type'  => 'post',
        'post_type'    => 'post',
        'field' => [
            'field_type' => 'checkbox_list'
        ]
    ],
] );
}

Please read more on the documentation https://docs.metabox.io/extensions/mb-relationships/#using-code
https://docs.metabox.io/fields/post/