For skype I'm curious how much will be written in JS, I'm assuming crypto won't be? I could well be wrong but I thought with an interpreted language it would b

For skype I'm curious how much will be written in JS, I'm assuming crypto won't be? I could well be wrong but I thought with an interpreted language it would be very hard to protect against timing attacks? Wouldn't a lot of the network communication also be utilising compiled libraries?