The problem still occurs on lucid.
I noticed that in the steps to reproduce I omitted one step, i.e. copy to 
clipboard.

The correct sequence with updated CPU usages for lucid is:
determine the baseline CPU usage by process Xorg (here, 5-7%)
open a blank OpenOffice Calc spreadsheet
select a cell and press CTRL+C to copy in the clipboard; the cell border 
becomes highlighted with a blinking dotted line
the CPU usage by process Xorg increases to 13-15%

selecting a group of cells (so that the blinking border perimeter is
longer, see attached screenshot) can bring the Xorg CPU usage as high as
70%

** Changed in: openoffice.org (Ubuntu)
       Status: Expired => Confirmed

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selecting a cell causes high CPU usage by X Server Process (Xorg)
https://bugs.launchpad.net/bugs/568892
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