Remove unused slides
Delete hidden slides
Compress images in the presentation
Reduce image resolution
Crop images instead of resizing them
Remove embedded fonts
Delete unused media files
Compress audio and video files
Save the file in PPTX format
Use linked files instead of embedded files
Remove speaker notes if not needed
Clear unused master slides and layouts
Reduce the number of animations and transitions
Use simpler charts and graphics
Save a copy with the “Optimize for compatibility” option disabled
Use PowerPoint’s “Compress Media” feature
Export images before reinserting them at smaller sizes
Split very large presentations into smaller files