Example of static screen at about 4 fps on a ryzen 7 1800X.

static.py

import sys
import random
# import math
from itertools import *

import numpy as np
import pygame
# from past.builtins import xrange

from profilehooks import profile


def get_pos_at_index(index, width, height):
    if index > width*height:
        return False
    return divmod(index, height)


def get_index_at_pos(x, y, width, height):
    if x*height+y > width*height:
        return False
    return x*height+y


@profile
def main():
    WIDTH = 400
    HEIGHT = 300

    WHITE = (255, 255, 255)
    BLACK = (0, 0, 0)

    clock = pygame.time.Clock()
    area_range = range(WIDTH * HEIGHT)
    pygame.init()
    pygame.mixer.init()
    size = WIDTH, HEIGHT
    screen = pygame.display.set_mode(size)
    surface = pygame.display.get_surface()
    font = pygame.font.SysFont('Arial', 16, bold=True)

    fps_count = 0
    tpf_count = 0
    fps_last = 0
    one_second = 1000
    while True:
        screen.fill(BLACK)
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                # sound.stop()
                sys.exit()

        # region Static Generator
        sample_list = np.random.randint(0, 255 + 1, size=(WIDTH * HEIGHT, 3))
        for i in area_range:
            # region Color Static
            surface.set_at(get_pos_at_index(i, WIDTH, HEIGHT), sample_list[i])
            # endregion

            # region Black and White variant
            # color = (0, 0, 0)
            # if random.getrandbits(1):
            #     color = (255, 255, 255)
            # surface.set_at(divmod(i, HEIGHT), color)
            # endregion
        # endregion

        # region FPS Counter
        msElapsed = clock.tick()
        tpf_count += msElapsed
        if tpf_count >= one_second:
            fps_last = fps_count
            fps_count = 0
            tpf_count = tpf_count - one_second
        else:
            fps_count += 1
        screen.blit(font.render("fps: " + str(fps_last) + ", ms: " + str(msElapsed), True, WHITE), (10, 10))
        # endregion
        pygame.display.flip()


if __name__ == '__main__':
    main()