Impact of big size

I'm making an educational application for mobile (phoneGap) there is a huge database of images that adds up to around 60mb exported (reduced by the wonderful png exporter of c2).

In local preview it takes ages to load, then is really really smooth. But on iPhone that can keep everything into ram. What about other devices? Is there any way to stream sprites on demand?

Thank you

I am not sure, but this Plugin might be helpful:

scirra.com/forum/plugin-load-image-from-url-at-runtime_topic45799.html

With this, you can load images from URL at runtime