Tilemap a big Texture to increase mobile perfomance

Hi

We are using a big Texture as main map 4096*4096. ( 2d game)
We zoom in and out on it, thats why it has to be that big.

The map has a big impact on the fps on the mobile device.

We are now tryieng to improve it by using the Tilemap system.

Cutting it into power of 2 tiles.

The idea is that it can cull out tiles (part of the image) when they are not on the screen.

(The file size already decreased by 3 %)


What do you guys think
any perfomance improvements possible through that?
Or will it get even worse?

 

Ok by splitting the map into 1024 pieces and fit them in a tile map
the fps increased between 0.4 to 2fps

 

Splitting it further to 512 tiles had not further perfomance benefit.