To move a mouse pointer have been done in many different ways.
To do it in Python why not. Its not about speed its about doing it in Python. 
Few examples of this package, this approach is only to show do shell script and python in AS.
https://pyautogui.readthedocs.io/en/latest/index.html
Its works for Python 2 or 3
pip install pyautogui to install the package to be able to run the script below.
Comment out ## to try all exemples.
(**
* Python library to do automation tasks for (Python 2 or 3)
*
* pip install pyautogui
*)
set theScript to "
import pyautogui
import time
##print(pyautogui.size()) # size of the screen in width and height
##width, height = pyautogui.size()
##print('Width is',width, 'points')
##print('Height is',height, 'points')
time.sleep(1) # sleep for 1 second
##print(pyautogui.position()) # mouse position in x, y position
##x, y = pyautogui.position()
##print('Current x-pos is',x,'points')
##print('Current y-pos is',y,'points')
##pyautogui.moveTo(50,50) # move the mouse pointer to x, y position
##x, y = pyautogui.position()
##print('Start x-pos is',x,'points')
##print('Start y-pos is',y,'points')
# Same as above with time from start to end position
##pyautogui.moveTo(400,400,3)
##x, y = pyautogui.position()
##print('Move to x-pos',x,'points in 3 second motion')
##print('Move to y-pos',y,'points in 3 second motion')
# click at Apple icon in menubar and do 3 second motion
pyautogui.moveTo(25,10,3)
pyautogui.click()
##pyautogui.click(25,10) # click at Apple icon in menubar with x, y position
# Script Editor hotkey to preferences...
##pyautogui.hotkey('command',',')
"
do shell script "/usr/local/bin/python3 <<EOF " & theScript
To draw a rectangle shape in ex. Pixelmator you could add this code.
The mouse position x, y top left in clock wise order
# To draw freeform in Pixelmator (could be any application that could draw)
pyautogui.dragRel(100, 0, button='left')
pyautogui.dragRel(0, 100, button='left')
pyautogui.dragRel(-100, 0, button='left')
pyautogui.dragRel(0, -100, button='left')