почему отличается время

import time
import random

"""
def insertion_sort(array):
    for i in range(1, (len(array))):
        item_to_insert = array[i]
        j = i
        while j > 0 and item_to_insert < array[j-1]:
            array[j] = array[j-1]
            j -= 1
        array[j] = item_to_insert
    return array


data = []
for k in range(9999, 0, -1):
    data.append(k + random.random())

start_1 = time.perf_counter()
insertion_sort(data)
end_1 = time.perf_counter()
print(end_1 - start_1)
# print(data)
""" ===============================================> 6.2 сек.


"""
data = []
for k in range(9999, 0, -1):
    data.append(k + random.random())

start_2 = time.perf_counter()

for i in range(1, (len(data))):
    item_to_insert = data[i]
    j = i
    while j > 0 and item_to_insert < data[j-1]:
        data[j] = data[j-1]
        j -= 1
    data[j] = item_to_insert

end_2 = time.perf_counter()
print(end_2 - start_2)
# print(data)
""" ===============================================> 9.2 сек.