Cloudflare Rocket Loader doesn't work on mobile devices

I have really strange problem. The thing is it seems that Cloudflare Rocket Loader doesn't work on mobile devices, but works perfectly on desktops.

My website is loading for less than a 1 sec on desktops and for more than 12 secs(!) on mobile devices.

I checked Networking in Chrome dev tools.

This is what's happens on desktop: screenshot

And this is on Android device: screenshot

It seems that Rocket Loader is just ignoring everything. What could be the problem?