[Python] Turtle pauses when I try to turn it

Here is my code:

from turtle import Turtle, Screen
import time
import random

def check_wall_collision():
if ball.xcor() > (window.window_width() / 2) - 20 or ball.xcor() < -(window.window_width() / 2) + 20:
ball.left(180)
elif ball.ycor() > (window.window_height() / 2) - 20 or ball.ycor() < -(window.window_height() / 2) + 20:
ball.left(180)



window = Screen()


ball = Turtle(shape='circle')


while True:
ball.forward(7)
check_wall_collision()


window.mainloop()


This code basically makes a ball go forward until it collides into the edge of the screen, when it collides with the edge of the screen, it turns 180 degrees. The problem is though, when the ball collides with the wall, it pauses for a second or two before turning.

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