Console run's slow when using sleep with print(flush=True)

from time import sleep

for char in "Hello World. This is a test":
    print(char, end="", flush=True)
    sleep(0.05)

The output is laggy and print's 4 char's per half seconds
Output:
-Hell
-Hello Wo
-Hello World.
-Hello World. Thi
-Hello World. This is
-Hello World. This is a t
-Hello World. This is a test

How to fix it?