empty cells

When building a huge world map, like super metroid's, wich way would be more efficient: using a tilemap object for every room (meaning I will have about 200 rooms) or use just one, big tilemap for everything ? Do empty cells still take data ?

I don't believe there is any significant performance hit for using a single tilemap vs many.

Your main limitation will most likely be graphics memory. By separating your world into different layouts, you will be able to fit a wider variety of textures by utilizing different image sets for each layout. I'm not familiar with the kit's room system though.

As far as I understand, the more the renderer has to change tiles when it renders them, the slower it goes. So if you have a big space of the same tile, it will render quicker than a space consisting of different tiles.

Also, if you stack and overlap tilemaps, that also adds to the rendering process, therefor slowing it down.

This is what I have experienced.

thank you guys