Evenprime/Bukkit — comment on commit 1aafa6cdc3385b4a644e87a00be6b4f1f6e494ff
File: src/main/java/org/bukkit/permissions/PermissibleBase.java line 124
By Evenprime:

Adding an empty attachment can not change the permissions of a player. Recalculating them here will do nothing but waste CPU cycles.