hey frank/list, somehow I managed to get luagl working. (I did a fink install lua51 and lua51-dev and the rest (luagl/opengl) was still there from one of my earlier attempts - I am still trying to reconstruct the installation process... running the patch, that you posted some time ago (with the colored lines) I get an amazing speed advantage for lua. is this a valid performance test? because with lua I can draw 20000 lines at a cpu usage of 80%, the gem part eats up 80% already with 2000 lines (10:1). cheers, marius.