Compress pictures in PowerPoint
Use the Compress Pictures option
Choose a lower resolution
Crop images before inserting them
Remove unused slide masters
Delete hidden slides you do not need
Remove embedded fonts
Reduce the number of animations and transitions
Convert large media files to smaller formats
Compress audio and video files
Link to media instead of embedding it
Save the file as a PowerPoint Presentation format
Remove unused or duplicate slides
Clear speaker notes if not needed
Use simpler slide backgrounds
Avoid excessive use of high-resolution screenshots
Save a copy after optimizing
Use File > Info > Compress Media if available
Use File > Save As and choose a smaller format when appropriate