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#1

I got a .pptx file today that I downloaded and made some slight
modifications to.

The original download size was 4.8MB.

After modifications using Impress, the size blossomed to 24.9MB.

I loaded it into MS PP nad saved it, and it shrank back down to 6.4MB.

Why did Impress blow it up so large and yet PP was able to shrink it
just by loading and saving it, no changes?

That's not cool.

LO 5.4.5, Xubuntu 16.04 vs. Win 7 & MSPP 2013.

MR

#2

hello.
there was similar problem about saving pdf file which is fixed in
5.2.5 if i remember correctly.
you can subscribe and report your issue.
bugs.libreoffice.org
you can test previous versions and tell the first version that you
observed the problem on it.
hope that be useful for you and God bless!

#3

MR ZenWiz wrote

Why did Impress blow it up so large and yet PP was able to shrink it
just by loading and saving it, no changes?

Since both files (PPTX and ODP) are ZIP files with a different extension,
you can rename them and check which files each ZIP contains.
My guess is that ODP is storing un-needed font files. This has been reported
for years for ODT files
https://bugs.documentfoundation.org/show_bug.cgi?id=65353