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Libreoffice runs noticeably faster on my Athlon XP 2400+ with 512MB RAM than OO.org ever did. I think they can make it work - and on Android, their use of Java isn't really a penalty since the Dalvik VM is running all the time.
Have you tried recent releases of OO and LO ? There have been big improvements with OpenOffice 3 and later on my computer. Modern LibreOffice now shows up and loads most of my text documents in a matter of seconds, only big powerpoints can still take some time.