UI/Sprite textures aren't packed into a texture atlas by default. A tag is needed to group them. Read the documentation / tutorial on the sprite packer. Overlapping text/graphic boundaries with another text/graphic will create additional draw calls, even if the actual visual graphics do not overlap. Grids (other layouts too I presume) need minimum 1 pixel spacing between items, else items are considered overlapping and will create additional draw calls. Images with alpha 0 are still rendered. They are rendered with alpha 0 even though they are not seen. Unity currently does not support non-rectangle shapes as Sprites, so using the TightSpitePacker policy will cause image artifacts. When UI objects are offscreen, they are still batched (rendered as well?). Possible solutions: Change parent to non-UI parent, as UI Camera will no longer detect it Change layer of panel so UI Camera will no longer detect it Disable gameobject when off-screen ScrollRect performance tuning S...