RPCS3 is a PlayStation 3 emulator that allows you to play PS3 games on your PC. With the release of the Steam Deck, it has become an even more attractive option for gamers who want to play their favorite PS3 games on the go. However, getting good performance out of RPCS3 can be tricky, especially if you’re trying to play a game like Heavenly Sword that is known to be demanding. Here are some optimization settings in RPCS3 to get good frame rates for Heavenly Sword PS3 on the Steam Deck.
CPU:

GPU:

Advanced:

All other settings can be left at default. These adjustments will allow for smooth Heavenly Sword gameplay. Enjoy!
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
