threefish in python3 timing, encryption/decryption

import timeit

encrypt_check = "print(all(c[i] == t.encrypt_block(m[i]) for i in range(N)))"

decrypt_check = "print(all(m[i] == t.decrypt_block(c[i]) for i in range(N)))"

test_setup = """
from skein import threefish
import hashlib
import string
import random
key = hashlib.sha512(b'password').digest() # 64 byte key (512 bits)
tweak = b'This is my tweak'
t = threefish(key, tweak)
m = []
c = []
N = 50000
for i in range(N):
    m.append(bytes("".join(random.choice(string.printable) for i in range(64)), encoding='utf8'))
print("Done generating random strings")
for i in range(N):
    c.append(t.encrypt_block(m[i]))
print("starting")
"""

timeit.repeat(encrypt_check, setup=test_setup, number=1, repeat=5)
# [0.02347087860107422, 0.02314305305480957, 0.02311396598815918, 0.022945165634155273, 0.022997140884399414]
# 23.134 +/- 0.183 ms

timeit.repeat(decrypt_check, setup=test_setup, number=1, repeat=5)
# [0.023146867752075195, 0.02331399917602539, 0.023048877716064453, 0.023074865341186523, 0.023090124130249023]
# 23.135 +/- 0.095 ms