1. Objective-C doesn't do automatic runtime reference counting the way Python does AFAIK. You either do it yourself where needed, or it's automatically inserted and heavily optimized at compile time by ARC. (I could have misunderstood how Python does it, but I think it does more refcounting than Objective-C does.)
2. Although Objective-C is pretty fast in the grand scheme of things, using its object system does entail a performance penalty when compared to similar languages like plain C or C++.
3. The garbage collector, despite being really immature and pretty quickly falling out of favor, actually did often give better performance in heavily threaded situations.
1. Objective-C doesn't do automatic runtime reference counting the way Python does AFAIK. You either do it yourself where needed, or it's automatically inserted and heavily optimized at compile time by ARC. (I could have misunderstood how Python does it, but I think it does more refcounting than Objective-C does.)
2. Although Objective-C is pretty fast in the grand scheme of things, using its object system does entail a performance penalty when compared to similar languages like plain C or C++.
3. The garbage collector, despite being really immature and pretty quickly falling out of favor, actually did often give better performance in heavily threaded situations.