Git pull with auth is slow with PIPE

git_pull.py

import tempfile
import subprocess
import timeit


class GitWorkerPipe(object):

    def start(self):
        cmd = subprocess.Popen(["git", "pull"], stdout=subprocess.PIPE,
                               stderr=subprocess.PIPE)
        print(cmd.stdout.read())
        print(cmd.stderr.read())
        cmd.wait()


class GitWorkerTemp(object):

    def start(self):
        my_stderr = tempfile.TemporaryFile()
        my_stdout = tempfile.TemporaryFile()
        cmd = subprocess.Popen(["git", "pull"], stdout=my_stdout,
                               stderr=my_stderr)
        cmd.wait()
        my_stdout.seek(0)
        my_stderr.seek(0)
        print(cmd.returncode)
        print(my_stdout.read())
        print(my_stderr.read())
        my_stdout.close()
        my_stderr.close()


def main():
    t = timeit.Timer(GitWorkerPipe().start)
    print(t.timeit(1))
    t = timeit.Timer(GitWorkerTemp().start)
    print(t.timeit(1))


if __name__ == '__main__':
    main()