Adding/Removing marker components?

Does adding or removing a 'marker' component (i.e. an IComponentData without any fields on it) cause an entity to be shifted to another archetype chunk? If they are, is there any performance issues with adding/removing tons of marker components?

 

Yes it does (ArchetypeChunk.Has(ComponentType) works on marker components).

Are there performance issues? Maybe...
Added or removing a component effectively moves the remaining component data for that entity to a chunk with like archetypes.The performance cost of this varies depending on the size of the other entity's components, and probably some other factors as well. However, keep in mind that part of the performance benefit of ECS comes from keeping entity data packed together with like archetypes. Adding a tag component will cost performance in that you must move some data, however, that entity (and its data) is now packed together with like archetypes for more efficient processing, which could net you a performance gain overall.
As always, remember to profile.

 

Okey, thank's for the confirmation.