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1. IMP caching optimization technique

   Cache the implementation pointer for -[NSString hasPrefix:]

   SEL hasPrefixSelector = @selector(hasPrefix:);
   BOOL (*hasPrefixIMP) (id, SEL, id) = (BOOL (*) (id, SEL, id))[@"" methodForSelector:hasPrefixSelector];
   

   Use the cached pointer instead of sending the message

   BOOL b = hasPrefixIMP (@"Europe", hasPrefixSelector, @"e");