RPCS 3 operates solely on the CPU
RPCS 3 operates solely on the CPU
This seems more related to a Steam Deck setup. You have RPCS 3 working on both your Steam Deck and PC, yet you're experiencing performance drops in Fight Night Champion. The GPU isn't reaching its full potential even though it's using all available threads. It might be due to hardware limitations or settings. Checking for any GPU utilization tweaks or driver updates could help. Also, ensure no background processes are consuming resources.
I'm not sure about your approach, but the Steam Deck's CPU might be too limited for PS3 emulation. You seem to be very CPU-dependent, which makes sense since PS3 games are typically heavy on processing power. It's possible that some games still run, though performance will likely be poor. Have you checked the RPc3 wiki for compatible titles and settings? Also, it's normal for the GPU not to boost much in RPCs3—most emulators behave similarly, being quite CPU-heavy.
It's because the emulation work is handled by the CPU, while the GPU mainly manages graphics that aren't needed even for basic or low-end systems. It's impressive how well it runs despite the CELL architecture.