Why is my presentation so large (97Mb) if I embed some fonts


I’ve created a presentation in which I wanted to embed fonts. The complete font set want to embed is 2.8 Mb.
I created a blank presentation, adjusted the ‘Styles’ in the master view to use my preferred font and saved with the option to embed fonts. The resulting presentation file is 97 Mb. What could be the reason? How can I reduce the size, still keeping my preferred font embedded in the presentation?

Thanks for your feedback.

In case you need more details, please let me know.

I tested on Xubuntu 16.04 - LibreOffice Version:

What size was the file before you embedded the fonts?