If you do have too many things to load, you could combine spritesheets into one, which then you would only be loading one spritesheet per object.
Heres an example:
If you really wanna get performant, you could have an atlas of everything which then you would only load 1 image ever. However that would require a lot more work to implement.
Also I would look at how big the images your trying to load are, because bigger image will be longer to load.