Hi Tomas,
First I need to give you an apology regarding Pi/GEOS. The 1.1 version works well on my Pi3B with CI-latest. I must have been dabbling with one of the previous versions, when I got the performance issues. I will use this version of Pi/GEOS on my Pi, and skip the DOSBox version.
I also tried to install a Geosworks 1.2 installation, but get an error message in Pi OS. Below is the screen shot.
I have also noticed when I exit the menu, I need to press ctrl+esc to exit and then ctrl+c multiple times to get to the cli mode (terminal or prompt or whatever one calls it).