How to Optimize my Android Trivia Game?

I'm building an Android picture puzzle game which will have like 100+ pictures / sprites. Now, if I add these in the scene all at once to show up in the menu, the draw calls are like 100+. And as a result my game, especially the animations are kind of lagging on my nexus 5. I'm using Unity 5.1.1, i'm not sure if this is because of the bugs in unity 5 or the number of sprites on show.

It would be great if you guys could help me out on this!

EDIT: The animations are very basic menu animations like sliding keyboard, panels etc

 

Try using a sprite packer tag.

 

@blizzy I did. It didn't help much as all the sprites size is 512*512. It would fit 4 sprites in 1 atlas. However, the draw calls didnt change

 

The draw calls should have gone down at least a bit, if you use the same material for each of your sprites.

 

I don't have any material for the sprites

 

Then you are probably using the default material.

 

i have set it to none

 

That works? Try using "Sprite-Default" and see if that makes a difference. Your sprites might look different because of the shader.

 

I'll give it a try. Tell me something, does 100 draw calls make your game lag though?