Sorry, I didn't have enough patience; I codn't imagine that
compiling lasts so long.
The second loading of "Draw" (and all subsequent ones)
work within a fraction of a second.
When I have tried loading the package a second time previously,
I errouneously had deleted the object files before.
I think, the Gnuplot-related bug has gone in your new
version (5.31.1-1), producing Postscript images works
fine with it.
Thank you very much
Wilhelm