loops=25000000

from math import*
a=range(1,loops)
def f(x):
  return 3*cos(x)+4*sin(x)**2
%timeit r=(f(x) for x in a)

import numpy as np
a = np.arange(1, loops)
%timeit r = 3 * np.cos(a) + np.sin(a)** 2

import numexpr as ne
ne.set_num_threads(1)
f = '3 * log(a) + cos(a) **2'
%timeit r = ne.evaluate(f)

ne.set_num_threads(4)
%timeit r = ne.evaluate(f)