How do you replace numbers in alphabet in python?

Finally, after a lot of head-banging, I found a way to avoid calling ord[], which, apparently, is very expensive. Below is the test code and results:

from timeit import timeit
from itertools import count
from string import ascii_lowercase


def alphabet_position_Headcrab[text]:
    nums = [str[ord[x] - 96] for x in text.lower[] if x >= 'a' and x