@jamrom2 Yes Space Taxi was definitely the biggest jump to nostalgia for me with the C64. I installed lr-vice from source. It's a bit clunky but ultimately I got it to work. Thank you for your suggestion. Load time was about 2 minutes. Had to hit select/coin to bring up the virtual keyboard just to get past the cheat menu. Then I was finally able to use the joystick.

Thanks again for your help!

We may have to amend the docs and don't recommend ds4drv anymore. Try with regular bluetooth pairing again - it should work.

@Neo-Rio
Thanks, this did the job.
I cleaned the D64 files and put the T64 files onto "new" D64 disks. Now they all run like expected .
I even exported some files from the d64 into PRG files. They also auto run, but they only show RUN. This takes away some of the nostalgia.

@BuZz said in Poor C64 Vice performance on Epyx "Impossible Mission":

Source is updated. If you update RetroPie-Setup script and then install vice from source the fastsid backend should be available again.

Cheers mate!
Took me a while to figure out how to enable wifi first on my Zarcade. And I had to buy a keyboard first of course. Today I was able to update the Vice package. Found the FastSid setting (6581).
The proof of the pudding in my favourite game: When you travel up or down with the elevator for a long time, there is no more stuttering in the elevator sound.
Thx !!