iSlide > Animation > Scale Time
[Scale Time] allows you to adjust the duration of animation, page break, etc.
The Scale Ratio is 1 by default, which is the original duration of PowerPoint.
For example: The total duration of a PowerPoint animation is 4 seconds, including a 2-second animation delay. If I adjust the [Scale Time] to 0.5, the duration is scaled to 50% of the original animation. That is, the total duration of the animation becomes 2 seconds and the animation delay becomes 1 second.