python - why is my code really slow and how can i improve it?

Question

This question already has an answer here: question from:https://stackoverflow.com/questions/65860414/why-is-my-code-really-slow-and-how-can-i-improve-it

Answer 1

There are some issues in your code, but the most obvious thing is that you are loading the image into the application loop. pygame.image.load is very time consuming, because it has to read the images from the data store.

Load the image once before the application loop, rather than continuously in the loop:

sky=pygame.image.load("sky.jpg")      # <--- ADD

running=True
while running:
    # [...]

    # sky=pygame.image.load("sky.jpg")  <--- DELETE