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FYI, <https://wiki.documentfoundation.org/index.php?title=ReleaseNotes/5.2&oldid=124119#General>: "Support was removed for the undocumented perftune.ini flags FastPipeCommunication (core commit f8f87780f5f7be5ff185b0b8b3206d760d9dfed6) and QuickstartPreloadConfiguration (core commit d3084fb2442b9584b46fba743158c3fe46defa81)."
I assume nobody using LibreOffice was relying on those undocumented features that were added to OpenOffice.org/StarOffice back in the day.