"Play it on a C128 in C64 mode and it’s fastest of them all.
To help to even out the speed difference between the busy and non-busy screens there is an option to Lock the Maximum Game Speed (FPS) in the Setting & Cheat Screen in the Front End. (This option won’t slow down the busy screens at all on a stock machine). It will default to On if an accelerated machine is detected. It will also default to On if a C128 has been detected (The C128 version was running too fast for the sound fx to keep up!). There are a number of different speeds that can be selected or it can be switched off altogether."
"Native C128 Vic II & VDC and Plus4 versions and source code will follow."