I am coding a sandbox game in Python, but my water is just flowing too slowly.

I used these rules:

1) If there's no element under it, just fall by one pixel

2) If there's an element under it, fall diagonally, left or right is random (if you can)

3) If it can't fall, go randomly to the left or right by one pixel

Can somebody tell me how water is working on tpt so I can improve my script? (I don't want to use pressure, velocity or temperature yet, it would just lag too much)

I found out that it was doing that only when the water is flowing to the right, because of particle update order, but I don't know how to fix it