Further investigation has identified this to be a SMB issue after all,
which is unrelated to the libreoffice package.
** Changed in: libreoffice (Ubuntu)
Status: New => Invalid
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Note that this is unlikely to be a network issue. Much larger files from
the same SMB share are opened with other applications almost
instantaneously.
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** Attachment removed: "journal.txt"
https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/1719685/+attachment/4957362/+files/journal.txt
** Description changed:
Opening even small files (14.3kB) from an SMB share results in delays of
20 seconds or more.
Clicking to close the
