Every emulator running with terrible framerate in Game mode, but they run great in desktop mode

I installed a couple of roms using the Chimera web interface into ChimeraOS, I can see them great in the Steam interface after a reboot. But, every rom, no matter how old the game is (even Super Mario for SNES) runs badly, under 10 fps. My hardware is well capable of running those roms (SER5 Mini PC, AMD Ryzen 7 3750H, AMD Radeon Vega 10, 16GB RAM) and I can even confirm it by running them in desktop mode (solid 60 fps in most games).

Now I don't know or choose the emulator Game mode uses, I just followed the instructions that require me just to upload the rom and select some pictures and icons, and then try to run the rom.

What's going on? I mean I can use desktop mode, but I prefer the Game mode interface. I know game mode is not trying to run the roms at insane scaling and/or with crazy filters/resolutions because I can see them running at native config, but yet, they run bad. Am I missing something?

Reproduce the same ROM in ChimeraOS Game mode and desktop mode, recording the emulator and launch configuration used; the report names no source file or test. Trace the Game mode launch path from the Steam interface and compare it with desktop mode, then confirm done when the affected ROMs sustain their expected framerate in Game mode.

Written by the indexing model from the issue text.