https://wiki.documentfoundation.org/images/0/0f/GS42-GettingStartedLO.odt Opening that in 5.0.6.1 (to mention one) is slow, but after that editing is possible.
AndrewMacro.odt http://www.pitonyak.org/AndrewMacro.odt (version 2015-06-12) seems not to open too.. but I've only waited 3 minutes now ;)
Confirmed with v5.2.0.0a1 under ubuntu 16.04 x64. Well scrolling with v5.0.6.1 is already a bit slower, but not as bad as v5.1.3.1+ With an early dev version v5.0.0.0b3, it seems to work quite well. So set as regression.
that document looks familiar *** This bug has been marked as a duplicate of bug 96089 ***