[Python] How to make faster Mandelbrot set plot

Ive written a function which uses turtle to draw a Mandelbrot set, however its very slow (~10's minutes) for any decent resolution, how could I make my code more efficient?

import math, turtle

screen = turtle.Screen()
screen.setup(width=1000, height=600 ,startx=0, starty=0)
screen.bgcolor('black')
screen.tracer(0)
pen = turtle.Turtle()
pen.penup()
pen.speed(10)
width = 800
height = 600
MAX_ITER=80

def draw_mandelbrot(c):
z = 0
n = 0
while abs(z) <= 2 and n < MAX_ITER:
z = z * z + c
n += 1
return n

def generate_mandelbrot_set(StartR, StartI, EndR, EndI):
screen.setworldcoordinates(StartR, StartI, EndR, EndI)
screen.bgcolor("black")
for x in range(width):
for y in range(height):
c = complex(StartR + (x / width) * (EndR - StartR), StartI + (y / height) * (EndI - StartI))
m = draw_mandelbrot(c)
color = (255 - int(m * 255 / MAX_ITER)) / 255
pen.goto(StartR + (x / width) * (EndR - StartR), StartI + (y / height) * (EndI - StartI))
if y == 0:
pen.pendown()
elif y == height-1 :
pen.penup()
pen.color(color, color, color)
pen.dot()

generate_mandelbrot_set(-2,-1,1,1)

screen.update()
screen.mainloop()


Im new to coding so any advice would be hugely appreciated!

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