Video: Set the transition speed - Microsoft Support

Training: Each transition comes with a default speed that you can adjust. Watch this video to find out more.

Add, change, or remove transitions between slides - Microsoft Support

Set the start time and speed of an animation effect - Microsoft

How to add transitions and fades - Microsoft Support

How to Speed Up Video Playback in PowerPoint

Video speed changer Change video speed for diverse viewing needs

Set the timing and speed of a transition - Microsoft Support

Manage the Playback Speed of a Video or Audio in PowerPoint

Applying transitions in Premiere Pro

Microsoft PowerPoint, Tech Training

How to Loop a PowerPoint I Software Advice

Introducing the enhanced Teleprompter in PowerPoint Recording Studio