Tilemap Empty Spaces Performance

How do tilemaps handle empty spaces?

When they have a group repeated tiles, they do it similar to a Tiled Background. Are repeated empty spaces in a tilemap like an empty Tiled Background?

No, they're like no tilemap at all. Imagine crafting your tilemap out of adjoining tiled background objects. The gaps are truly empty, and the tilemap object is the same.

Ah alright, thanks Ashley.