With what file format? I have tested with DOC and DOCX and Libre Office is several times slower doing pretty much anything - especially loading and saving.
Strangely enough, load and save times are something I don't worry about *at all*. The only thing that matters to me is functionality and usability - which is the whole reason I switched to OpenOffice and later LibreOffice in the first place. Caveat: it works for *me*, as usual, YMMV.