Hi
Generally if you want to use a high time scale, it is better to use AILerp as AIPath might overshoot at high timescales while AILerp will always follow the path exactly. AILerp also has much better performance.
Time.deltaTime already includes the time scale.
There was a similar question asked a short while ago: Why does AIPath not work with timescale? - #7 by aron_granberg