Reduce the file size of your PowerPoint presentations
To minimize the file increase, embed only those characters used in the presentation. Go to File > Options > Save. Under Preserve fidelity when sharing this presentation, select Embed fonts in the file, and then select Embed only the characters used in the presentation.
Compress your media files - Microsoft Support
You can improve playback performance and save disk space by compressing your media files. (This feature is available in PowerPoint for Windows, but not on PowerPoint for Mac or PowerPoint for the web.) Newer versions Office 2016. Open the presentation that contains the audio or video files.
Are you having video or audio playback issues? - Microsoft Support
To avoid audio or video playback issues in PowerPoint, you can optimize media files you've inserted into your presentation for compatibility on other devices. For a list of supported file types, visit Video and audio file formats supported in PowerPoint.
Tips for improving audio and video playback and compatibility …
If you experience slow playback, a lag between audio and video, audio stuttering, and frames being lost, there are a few tips that may be able to help you to improve the audio and video playback and compatibility of any media you include in your presentation.
Office apps appear the wrong size or blurry on external monitors
Mar 27, 2018 · Switch Office into Optimize for compatibility mode. Go to File > Options > General and in the User Interface Options section look for the When using multiple displays options. For more information see: Office support for high definition displays.
Use compatibility mode to work with different versions of PowerPoint
Save your PowerPoint (.pptx) presentation as a 97-2003 (.ppt) file, use compatibility mode, run Compatibility Checker, or convert a presentation to a later version.
Change the default resolution for inserting pictures in Office
Beginning with Office 2016, Word, Excel, and PowerPoint have a High fidelity image resolution option that allows you to insert a picture into a document with minimal compression for optimal rendering on high-resolution displays.
Reduce the file size of a picture in Microsoft Office
You can reduce the file size and save disk space by compressing pictures in your document. The compression options reduce both the file size and picture dimensions based on how you intend to use the picture, such as viewing on screen or in an email message.
Turn off picture compression - Microsoft Support
Turn off compression in Word, PowerPoint, or Excel. Click File > Options. In the Options box, click Advanced. In the list at Image Size and Quality, do one of the following. (This example shows the options in Word.) Ignore the drop-down list to select your current document by default.
Video and audio file formats supported in PowerPoint
If you experience slow playback, a lag between audio and video, audio stuttering, or frames being lost, see Tips for improving audio and video playback and compatibility. PowerPoint may also support additional file types if you install additional codecs on your PC.
Insert and play a video file from your computer - Microsoft Support
Under Optimize Media Compatibility, there will be information about all media files in the presentation—whether they are linked or embedded in the file. If there are any linked videos, PowerPoint gives you a View Links hyperlink.