How does the attack speed work?

How does the attack speed mechanism work? I searched a lot of information, and the conclusions are almost opposite. Some people think it has nothing to do with the tick rate, which is an integer multiple of 33ms, while others say that POE2 must follow the integer multiple of 33ms. My brain is about to explode. For 10 years, I have known that cooldown recovery is strongly related to 33ms, but there is no accurate answer for attack speed and casting speed.