A_PLUS_B_TABLE = dict()

for i in range(256):
    current = dict()
    for j in range(256):
        current[j] = i * j
    A_PLUS_B_TABLE[i] = current


def mulfast(x, y):
    return A_PLUS_B_TABLE[x][y]


def mulslow(x, y):
    return x * y


randtab1 = [randint(1, 255) for i in range(2000)]

randtab2 = [randint(1, 255) for i in range(2000)]

print(timeit(lambda: sum(map(mulfast, randtab1, randtab2)), number=NITERS))
print(timeit(lambda: sum(map(mulslow, randtab1, randtab2)), number=NITERS))