Response to "Surprising ARC performance characteristics" (http://blog.securemacprogramming.com/?p=668)

gistfile1.m

[myDictionary enumerateKeysAndObjectsUsingBlock: ^(id key, id object, BOOL *stop) {
  //...
}];

to:

for(id key in myDictionary) {
  id object = myDictionary[key];
  //...
}

or even:

for(__unsafe_unretained id key in myDictionary) {
  __unsafe_unretained id object = myDictionary[key];
  //...
}