How to slowly scroll down the static page using selenium python

I am trying to make web page automation where I am using selenium in python3.6. I have done most of it, I just have to scroll down a page which is static. To scroll down the page I am first getting the height of the page and then doing:

while True:
    height = driver.execute_script("return document.body.scrollHeight")
    scroll = 100
    time.sleep(2)
    while scroll < height:
        driver.execute_script("window.scrollTo(0," + str(scroll) + ");")
        scroll = int(scroll) + 100
        time.sleep(3)

This is working fine but the only issue with this is that it scrolls a bit faster. Yes I can increase the time.sleep() but I want to control the scroll speed here. Is it possible with selenium. Thanks

Also, if can anyone point any wrong thing I am doing with above code