iOS - Multiple layers making animation slow

Try setting setShouldRasterize:YES to your layers OR your superlayer.

If the animations should be executed sequentially, computing your every animation delay time, it's should be like this:

CGFloat everySubLayerAnimationDuration = 1.5f; // or other 
for (int i = 0; i < sublayers.count; i++)
{
    [UIView animateWithDuration: everySubLayerAnimationDuration * i
                     delay:0.0f  
    ......
}