The first thing people do with an oversized deck is delete slides, which is the one thing that does not help: the pictures live in the file once and stay there. It is worth one minute of looking before cutting anything.
This shows the parts by size, names the biggest ones and says which tool takes the weight out: re-encode the pictures, extract the audio and video, remove the unused masters, or drop the embedded fonts.
See what is actually taking up space in a .pptx, part by part, and what to do about it.
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