One of the most common factors that leads to slow presentations is a large presentation file size. Most of the time, it's caused by embedded videos and pictures.
If your .PPTX file is 20MB or larger, you may benefit from some downsizing, which should in turn speed up your presentation.
Click this link to see a Microsoft tutorial in reducing file sizes by compressing, trimming, or deleting edited picture data.
If your .PPTX is still on the heavy side, try linking instead of embedding videos. Click here for another useful article on the different ways to insert videos.
If all else fails, the last resort is to break the file into smaller, more manageable files. Reporting will be less convenient and you may have to do some fancy file-work during a break, but it just might save your presentation.
It's a good idea to avoid 100-slide presentation anyway, just to keep your audience entertained and allow for short bio breaks.
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