Okay kiddo, have you ever seen a car going really fast on the road? Of course you have! Now imagine that instead of going fast, it's going very, very slow - like a snail. That's what we mean when we say "as slow as possible."
Sometimes going slow is a good thing. It helps us be careful and avoid making mistakes. For example, when we're learning a new skill like riding a bike, we might need to go slowly at first so we don't fall off.
In other cases, going slow can be frustrating. Like when we're waiting for something and it feels like it's taking forever. But sometimes we have to be patient and wait for things to happen at their own pace.
So remember, going slow can be good or bad, depending on the situation. But when we say "as slow as possible," we mean taking our time and being patient.