ðə pˈɛɹ sˈɜːtʃ skˈeɪlz kjˈuːbɪkli ænd ɪz ðə slˈoʊɪst pˈɑːɹt ʌvðɪ ˈælɡɚɹˌɪθəm ɐsˈaɪd fɹʌm ˈɛnɚdʒi kˌælkjʊlˈeɪʃənz.
The pair search scales cubically and is the slowest part of the algorithm (aside from energy calculations).