Thats why i wrote about synchron-(de)compression during loading or saving.
I wrote about the rpi0 boot time, it is far away from fast, no games installed only the fresh Image.
The rpi3 is much faster, but i think it is worth to do some research in this direction.
A nearly instand on could be a big benefit against the competitiors.
How much memory is really used at the point where ES apears?