[camus2]

The issue is not wether spidermonkey or v8 is faster than dalvik, the issue is wether the UI feels responsive or not.

On a low hand device,you cant honestly say, an HTML5 ui on firefox os will be faster and more reponsive than an android ui coded with the android framework. Wether X javascript engine is fast or not is irrelevant. Users are not stupid, they can tell a fast and responsive ui from a clunky HTML/JS one.

Finally Javascript gives you 0 tool for manual memory management,which is central for any embedded programming. On Android and Iphone one can go down to C/C++ if necessary.

The idea of a 25$ device that would run javascript programs/uis efficiently is preposterous.

[pcwalton]

> Finally Javascript gives you 0 tool for manual memory management,which is central for any embedded programming. On Android and Iphone one can go down to C/C++ if necessary.

asm.js offers manual memory management, with no garbage collection. You can compile C and C++ and it will run essentially natively, modulo the sandboxed safety checks.