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up vote 26 down vote favorite 11 The following Python 3.x integer multiplication takes on average between 1.66s and 1.77s: import time start_time = time.time() num = 0 for x in range(0, 10000000): # num += 2 * (x * x) num += 2 * x * x print("--- %s seconds ---" % (time.time() - start_time)) if I replace 2 * x * x with 2 *(x * x) , it takes between 2.04 and 2.25 . How come? On the other hand it is the opposite in Java: 2 * (x * x) is faster in Java. Java test link: Why is 2 * (i * i) faster than 2 * i * i in Java? I ran each version of the program 10 times, here are the results. 2 * x * x | 2 * (x * x) --------------------------------------- 1.7717654705047607 | 2.0789272785186768 1.735931396484375 | 2.1166207790374756 1.7093875408172607 | 2.024367570877075 1.7004504203796387...