How can Swift be so much faster than Objective-C in these comparisons?

Posted by Yellow on Programmers See other posts from Programmers or by Yellow
Published on 2014-06-02T21:55:00Z Indexed on 2014/06/04 15:42 UTC
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objective-c

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comparison

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apple

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swift-language

Apple launched its new programming language Swift at WWDC14. In the presentation, they made some performance comparisons between Objective-C and Python. The following is a picture of one of their slides, of a comparison of those three languages performing some complex object sort:

enter image description here

There was an even more incredible graph about a performance comparison using the RC4 encryption algorithm.

Obviously this is a marketing talk, and they didn't go into detail on how this was implemented in each. I leaves me wondering though:

How can a new programming language be so much faster?
Are the Objective-C results caused by a bad compiler or is there something less efficient in Objective-C than Swift?
How would you explain a 40% performance increase? I understand that garbage collection/automated reference control might produce some additional overhead, but this much?

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