A simple way to profile execution time of a code snippet.

gistfile1.m

static CFAbsoluteTime JAProfilingBlock (void (^block)(void)) {
  CFAbsoluteTime start = CFAbsoluteTimeGetCurrent();
  block ();
  CFAbsoluteTime end = CFAbsoluteTimeGetCurrent();
    
  return end - start;
}

#example usage  

CFAbsoluteTime filteringTime = JAProfilingBlock(^{
  [newArray filterUsingPredicate:self.filterPreficate];
});
NSLog(@"time to filter the array: %f", filteringTime);

Thanks!