other question:
q4) how can I add, by program, a Lisp file in Application SuitCase Startup?
It's saved in the registry: HKEY_CURRENT_USER\Software\Autodesk\AutoCAD\[Revision]\[Version]\Profiles\[CurrentProfile]\Dialogs\Appload\Startup\
Each item is listed in there as #Startup of type REG_EXPAND_SZ, though a normal text type should do also. Note the NumStartup value contains the count of how many items, so you might also need to update this.
Note 2: If you've never added anything into the Startup Suite before, this folder (HKEY_CURRENT_USER\Software\Autodesk\AutoCAD\[Revision]\[Version]\Profiles\[CurrentProfile]\Dialogs\Appload) might be empty, so you should then create the Startup sub-key.
n1) if I run in background the process is more slow and one time i saw x64VBAServer18.exe running
Old problem, since 2005 it's been something to avoid like the plague. Background plot/publish has always been this slow, not to mention error prone. Ensure BackgroundPlot is
not set to 2 or 3 - actually I set mine to 0 so plots are also in the foreground.
As for the Measurement thing, that does sound like a BIG problem. I'd also like to know what to do about this.