Xcodeで処理速度計測

NSDate *startDate = [NSDate date];
//do something
NSTimeInterval interval = [[NSDate date] timeIntervalSinceDate:startDate];
NSLog(@"time is %lf (sec)", interval);


下記より引用
http://d.hatena.ne.jp/mmasashi/20100524/1286123680

へー、なるほどね。