Demon's Souls not working

I am new to RPCS3 and I have been tinkering with Demon's Souls for a couple of weeks. Often times I get the white screen when changing settings to improve performance.

I followed advice on Youtube from a user named Gidrah to implement the best settings. His Youtube guide is a slightly different screen layout from the current RPCS3 build but the settings are still the same. In regards to your screenshot settings I would suggest;

CPU:
Firmware Settings: check only "Load lblv2.sprx only"
Preferred SPU threads: lower number is better. Start with one
Additional Settings: check only "Enable SPU loop detection"

GPU:
Framelimit: Off
Resolution Scale Threshold: 24x24

These work well for me. I usually only get the white screen now when I am trying different settings.

Best of luck