Pygame clock tick stuttering

This is an issue that has been bugging me for a few weeks now. Whenever I have a pygame clock variable, so for example: clock = pygame.time.clock and I limit the fps using: clock.tick(fps) the game will occasionally stutter. I have a simple example below - a window with a cube that moves from side to side.

import pygame

screen = pygame.display.set_mode((0, 0), pygame.FULLSCREEN)
width, height = screen.get_size()

rect = pygame.Rect(0, height // 2 - 50, 100, 100)

delta_x = 5

clock = pygame.time.Clock()

running = True
while running:
    event = pygame.event.poll()
    if event.type == pygame.QUIT:
        running = False

    screen.fill((0, 0, 0))

    if rect.left < 0 or rect.right > width:
        delta_x *= -1

    pygame.draw.rect(screen, (255, 255, 255), rect)
    rect.x += delta_x

    pygame.display.flip()

    clock.tick(60)

Video: https://www.youtube.com/watch?v=6spFoKIqVQY&ab_channel=NotAHackusator
Does anyone know how to fix this? Thanks in advance.

Solution

Setting clock.tick to 144 from 60 makes the stutter go away from my end. I'm not not sure if you want it to be limited to 60 and why though.