This one is very CPU hungry but doesn't necessarily need more than 2.4/2.6 GHz up to keep 40 fps and it helps keep the power draw near a manageable level. The power draw does increase significantly during battle as the CPU utilization increases so average draw varies.

PowerTools:
CPU Frequency Maximum: 2400 MHz (2.4 GHz)

Additional Steam Deck Performance Menu Settings:
Allow Tearing: On

Game Settings:
Windowed Mode: Fullscreen
Quality Preset: Very Low
Character Detail: 1
Framerate Limit: No Limit
Temporal AA: One
VSync: On
Frame Blending: Off
Sync CPU to GPU: Off
Warp Weather Settings: Off
Warp Heat Effects: Off