I know they said on stage that they've spent a lot of time getting Swift fast, but aren't we still in beta? Isn't it a bit early to throw Swift under the bus for performance reasons?
Problem is everyone wants to know whether they just skip to swift right now or just wait a few years until the tech matures.
Claiming a speed increase of x2 and ending with -x2 is a 400% difference. We're not talking minor differences here.
As a sidenote, i've recently heard Core Data wasn't used internaly by Apple. Makes me think that i'll skip to swift once apple gives me the list of which of their app is coded with this language.
Based on the differences between ++i and i+=1 alone I would think that there are just bugs they need to squash and that the open beta, and all these eyes on it, are going to help find the cases that are stumbling.
Also, for many of the tests where it was a 400% or order of magnitude knock in performance there are a lot of comments in here refuting those results, so I'm not sure what to think yet.
