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I guess it's a perfect pairing. Performance is probably less important for Cocos2d type of games (rather then low difficulty barrier).

Swift performs better than Objective-C which Cocos2d was already using, so I assume you are either misinformed or trolling.

I'm assuming they are referring to this post: https://news.ycombinator.com/item?id=7849213

which suggests Swift isn't actually more performant than ObjC.