Swift Around the Web
@designatednerd does a Big-O analysis on common data structures in Swift. There is clearly a lot of speed improvements that Swift needs to make, but it is definitely faster in some areas:
"Looking up items within an array is where Swift justifies its name. Lookups up by index and object grow at very close rates for both Swift arrays and NSArray. When you’re looking up by object, large Swift arrays perform 50 times faster than using comparable NSMutableArray objects."
If you're a Swift / iOS beginner, this is a great post for understanding the Who? What? When? Where? and Why? of extending a Swift Type.