[Python] ball slowing down while the paddle moves using turtle module

I am trying to make a ball bounce of a paddle using the turtle module. I am still developing the program. The issue is that when I hold down the left or right arrow key while the ball is moving then the ball is slowing down. Is there a way to fix this?

Below is the code.

main.py:

import turtle as tt
from paddletest import Paddle
from balltest import Ball

scrn = tt.Screen()
scrn.setup(width=800, height=800)
scrn.bgcolor("black")

paddle = Paddle()
ball = Ball(220)

scrn.listen()
scrn.onkeypress(fun=paddle.move_left, key="Left")
scrn.onkeypress(fun=paddle.move_right, key="Right")

while True:
ball.speed(1)
ball.forward(20)

scrn.exitonclick()


paddletest.py:

MOVE_DIST = 50
import turtle as tt

class Paddle(tt.Turtle):
def __init__(self):
super().__init__()
self.shape(name="square")
self.hideturtle()
self.penup()
self.color("white")
self.turtlesize(stretch_wid=1, stretch_len=5)
self.speed(0)
self.goto(x= 200, y=-100)
self.showturtle()

def move_left(self):
self.backward(MOVE_DIST)

def move_right(self):
self.forward(MOVE_DIST)


balltest.py:

import turtle as tt

class Ball(tt.Turtle):
def __init__(self, initial_movement):
super().__init__()

self.shape(name="circle")
self.hideturtle()
self.penup()
self.color("white")
self.goto(x=100,y=100)
self.showturtle()
self.speed(1)
self.forward(20)
self.setheading(initial_movement)


I suspect the ball slows down due to too many resources being used by the system, although I am not completely sure. Any help would be appreciated! Thank you

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