Thanks guys, autostart seems to load much faster now.
However, there is still the problem that "warp mode" is still seems to be turned on after the game starts.
I enabled the statusbar and it says that VICE is running at 187%
However, the asterisk in the emulator-menu for warp mode is not showing.
Maybe using a fastload .crt is a solution.
However i still don't get it that the builds for Pi and Win are so different in their behaviour.