5.x writer slows down quickly

[einpoklum]

Since upgrading LibreOffice to 5.x versions I’ve noticed the following phenomenon working on documents in LO Writer: At first, the app is pretty speedy and responsive; but gradually, as I load and unload documents, as I change and update styles etc. - Writer becomes gradually more sluggish, less responsive, up to a point where I have to wait several_seconds for a copy-paste or a style change on a paragraph to take, on a document that’s not very long or complex.

Is this an issue other people have experienced? I can’t really pinpoint it to a certain kind of action, but I can say the following:

• I’m writing right-to-left Hebrew documents.
• This seems to happen more, or more quickly, when I load and unload very large documents originally in .doc format, with a lot of frames, footnotes, etc. and not just text. But I can’t say for sure.
• The effect seems to be a lot more pronounced when I change styles. Sometimes even browsing the styles becomes slow.

[blip]

Same behavior in Calc 5.x. Sometimes within a minute or two, sometimes after opening/closing/re-opening a few documents over the course of one or two hours.

• My spreadsheets are simple in nature; no formulas, static content.
• Phonetic characters with diacritics are used in some sheets, no IPA in others.
• Doesn’t matter whether my sheet contains several thousand lines or just ten.
• I use cell-coloring, freeze, AutoFilter, no font stylization, Liberation Sans.
• Mac, OS 10.11.4