Why does pygame load slow?

I have a simple project that display a “button” with an image,a text and a background color:

import os
os.environ['PYGAME_HIDE_SUPPORT_PROMPT'] = "hide"
import pygame, sys
from pygame.locals import *
import requests
import io

BLACK = (0, 0, 0)
RED = (255, 0, 0)
GREEN = (0, 255, 0)
BLUE = (0, 0, 255)
GRAY = (200, 200, 200)

class Main_window:
    def __init__(self):
        pygame.init()
        self.screen = pygame.display.set_mode((800, 600))
    def draw(self):
        Btn1 = Button(0,0,200,200,"hello",color=RED, text="test",text_color=BLACK)
    def mainLoop(self):
        done = False
        while not done:
            eventlist = pygame.event.get()
            for ev in eventlist:
                if ev.type == QUIT:
                    done = True
                if ev.type == MOUSEBUTTONDOWN:
                    Button.getButton(ev)
        pygame.quit()

class Button:
    Buttons = []

    def __init__(self, left, top, w, h,function,color=RED, text="", text_color = BLACK):
        self.left = left
        self.top = top
        self.w = w
        self.h = h
        self.right = self.left+w
        self.bottom = self.top+h
        self.function = function
        surf1 = pygame.Surface((w, h))
        surf1.fill(color)
        rect1 = pygame.Rect(left, top, w, h)
        main.screen.blit(surf1, rect1)
        Button.Buttons.append(self)
        if text != "":
            font1 = pygame.font.SysFont('chalkduster.ttf', 72)
            text1 = font1.render(text, True, text_color)
            text_rect = text1.get_rect(center=(int(w/2), int(h/2)))
            main.screen.blit(text1, text_rect)
        image_url = "https://image.flaticon.com/icons/png/512/31/31990.png"
        r = requests.get(image_url)
        img = io.BytesIO(r.content)
        image = pygame.image.load(img)
        image = pygame.transform.scale(image, (w, h))
        main.screen.blit(image, (0, 0))
        pygame.display.flip()

    def getButton(event):
        for i in Button.Buttons:
            x, y = event.pos
            if x>=i.left and x<=i.right and y<=i.bottom and y>=i.top:
                eval(i.function+"()")

def hello():
    print("hello")

main = Main_window()
main.draw()
main.mainLoop()

that’s works fine but the problem is that when i launch the game it load the main window, wait some time(something like 1 second) and then load the button.I tried to add more button and it loaded them one at a time.I don’t undestand why.

Answer

Two Fixes

1. Use a local image rather than an image sent with requests
2. It loads slowly maybe because of the draw function of the MainWindow class.
   Try this in the main loop function

    def mainLoop(self):
        done = False
        while not done:
            eventlist = pygame.event.get()
            for ev in eventlist:
                if ev.type == QUIT:
                    done = True
                if ev.type == MOUSEBUTTONDOWN:
                    Button.getButton(ev)
            self.draw()
            pygame.display.flip()
        pygame.quit()

And at the end

main = Main_window()
main.mainLoop()

So you don’t have to call main.draw() because it is already being called in the main loop.