byte concatenation vs io.BytesIO

bytes.py

# then why not simply use the above mentioned.

# optimization and performance

import io
import time

start = time.time()
buffer = b""
for i in range(0,90000):
    buffer += b"Hello World"
end = time.time()
total = end - start
print(total)


start = time.time()
buffer = io.BytesIO()
for i in range(0,90000):
    buffer.write(b"Hello World")
end = time.time()
total = end - start
print(total)

"""
1.8411164283752441
0.01295328140258789
"""