[[http://tuxtraining.com/2008/03/04/speed-up-start-time-for-openofficeorg/|Speed up  OoO startup time]]

  tools-> Java- uncheck use Java runtime environment

Go to any Open Office application (Writer, Calc, Impress, Math, Draw, Base) and then proceed to the Tools Menu. At the bottom of that menu select Optoins.

Under the OpenOffice.org heading, select Memory

Now change these settings:
Undo:
Number of steps = 25

Graphics Cache
Use for OpenOffice.org = 30 MB
Memory per Object = 2.0 MB
Remove from memory after 00:05 hh:mm

Cache for inserted Objects
Number of Object = 15

OpenOffice.org Quickstarter (check this box)