Optimizing the RPCS3 Custom Configurations for God of War III on the Steam Deck to get up to 24FPS. Use the following settings to get a max of 24FPS during game play. It will go down to around 14FPS when there’s a lot on the screen, but GOW III remains very playable. These are the best settings I’ve found so far:
Manage Game Patch settings:

Change Custom Configuration:
CPU:

GPU:

Advanced:

Keep all the other settings with default values.
Useful Steam Deck accessories:
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Docking Station for Steam Deck - HDMI 4K@60Hz, Ethernet, USB-A Ports, 100W USB-C Charging - Compatible with Steam Deck OLED
JSAUX ModCase for Steam Deck/Steam Deck OLED, PC0104 Steam Deck Case with Detachable Front Shell
Skull & Co. GripCase SD for Steam Deck: A Soft Protective Case with Textured Grips Full Protection and Stand, Shock-Absorption Non-Slip and Anti-Scratch Cover Design