If your images are glued together on both x and y axis you will have up to 4 images drawn at the same time. I had a similar problem and solved it with loads of small images loaded as textures and displayed when needed.

You can also load the image and then simply dividing it into smaller textures you can already get some improvements. Try also enabling clipping.

I am not sure about the underlying functions used for the memory management and display as the game engine was not written by me.

If your images are glued together on both x and y axis you will have up to 4 images drawn at the same time. I had a similar problem and solved it with loads of small images loaded as textures and displayed when needed.

You can also load the image and then by simply dividing it into smaller textures/tiles you can already get some improvements. Try also enabling clipping.

I am not sure about the underlying functions we used for the memory management and display as the game engine was not written by me.