Libreoffice on 16.04 - memory settings to prevent freezes?
Solution 1:
Uninstalling libreoffice-gtk* made a significant difference for me. The drawback is that the UI integration would go away.
sudo apt-get remove libreoffice-gtk*
It seems to be a known bug: https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/1577093