I've tried the actions of the video by not starting debian first, but starting OO3 directly via xTerminal ("debbie ooffice").

This boosts the speed approximately by a factor 2.

I've started OO3, than selected "new Textdocument" and typed the same sentence as in the video.
The last letter has shown up after 3min 36sec.
Still not fast, but it can be used to quickedit little files from friends while not sitting at a computer.

I'm happy with this solution for the moment, as I don't plan to create big amount of text here, but fill sometimes an excel-sheet with a few characters.

I hope native OO3 will be available soon, because the biggest slowdown seems to be because of loading debian in the background (taking a lot of RAM and CPU-power). I'm new to linux and the used technique to virtualize OO3 here, but why is it so noticeable faster when starting via xTerminal?
I mean it's not that I could type fluid, but it's really more performant this way, than starting it from debian (like in the video).

Thalon

P.S: Hello community :-)