I was doing some performance debugging of field_group and noticed performance dings in field_group_field_info_max_weight due to the max weight being calculated in EntityDisplayBase.
Token causes this to be invoked when viewing the field since $display_options doesn't provide a weight. Providing a weight avoids \Drupal\Core\Entity\EntityDisplayBase::getHighestWeight from being called and invoking that hook. It's a performance improvement for field value rendering.
Provide a weight of 0
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