LibreOffice 5.4 Adds More New Features, Improves Office File Format Compatibility (betanews.com)
The Document Foundation has released LibreOffice 5.4. Again, it's on time, arriving six months after the release of LibreOffice 5.3. From a report: LibreOffice 5.4 is "the last major release of the LibreOffice 5.x family," and like other point releases is a major one, adding features across all components and incrementally improving compatibility with Microsoft Office document formats. Highlights include a new standard color palette based on the RYB (Red Yellow Blue) color model. File format compatibility improvements include better support for EMF vector images and higher quality rendering of imported PDF files (with support for embedding video in exported PDFs from Writer and Impress). Also added is OpenPGP key support for signing ODF documents in Linux. LibreOffice Writer adds new context menu items for working with sections, footnotes, endnotes and styles. Users can now import AutoText entries from Microsoft Word .dotm templates. The full structure of bulleted and numbered lists is now preserved when pasted as plain text, and users gain the ability to create custom watermarks for their documents via the Format menu.
Since I can use it on a eeepc netbook I can't see where your speed complaints are coming from.
It kind of looks like you are making them up unless you are using it on hardware from last century.
I turned around and loaded the same document in to Word 2016. Word crashed. :)
I read at +2. If your post doesn't reach that level I will not see or respond to it.