Resogun [NPEA00433]

On PS3 the game is running at 30 fps ; apparently rpcs3 manages to run it at 20 fps so it's a 30% perf hit that makes it "laggy".

I don't get it why would they lock the game at 30fps
The movie files inside the game folder (USRDIR/video) are 59.94fps*

title.avi
Video: DivX 6 1280x720 59.94fps [Stream 00]
menu.avi
Video: DivX 6 1280x720 59.94fps [Stream 00]

Also I'm having a lot of issues in the game selecting menu, missing proper lighting on the cubes and flickering stuff all around. Using latest AppVeyor and the indicated LLE in OP's post.

You using very old build