A reason why Oo will get slower and slower to start is that it checks the pspfontcache file before starting, and this file gets bigger and bigger.
Here is a trick i found giving some improvement:
- delete ~/.openoffice/user/psprint/pspfontcache (your oo directory may have a different name)
- start OpenOffice and then quit (just to make it restore a clean pspfontcache file)
- make the pspfontcache read only to prevent it to grow : chmod 444 pspfontcache
Anyway im running mdk 9.1 and i recently upgraded to Ooo 1.1.1 : it's much much faster!