I suspect there is something slowing it. Data I/O from the SD partition can't explain while it is totally unresponsive in text entry, in comparison to what we got on the N8X0: so, there must be perhaps some kind of mechanism "nicing" the app; or allocating too low a memory for the application to work.

EDIT:
After some time openoffice writer seems to settle and become more responsive, almost like on the N8x0. I still have no clue on the reasons of such slugginess, though I suspect that much of the app code is swapped and this could be the culprit.
Being able to work, I could modify some properties and get a more manageable screen, like in the attached screenshot.
Modal dialogs are still a problem, though less because their font has been reduced. We need a way to move modal windows and reduce the height of the title bar.
Wmctrl did its job of maximizing the window; now we need a key combo to do that and a daemon which listens for it. Maybe those for easy debian will work?

Also, another problem, at least in my hands, is that the screen seems insensitive to the stylus pressure in an area about 1 mm around its edge, so the cursor can't reach those widgets that approach it closely. Is this a common problem, or it's just my device? I did screen calibration but nothing seems to change.