To get rid of the error messages (which produce stuttering) you can use the build on my homepage.

thanks for helping me 😀
i got rid of the stuttering with cycles=15000, frameskip=5
no more errors on the console with with binaries.

only problem left: the game runs slowly 😒
i have to wait about 1/2 second between screen updates when scrolling ...

core=dynamic
cycles=auto

Monitor processor usage with taskmanager

that hint was great ... the game is now really playable 😀