Use Proton Experimental

You have to enable NVIDIA Performance Mode only not On-Demand or Intel (Power Saving Mode).

Use these launch options: PROTON_USE_WINED3D=1 %command%

I also do thermal management by installing thermald and undervolting:

Thermal Management: The system is utilizing the thermald daemon for temperature regulation and fan control to ensure optimal thermal performance.

Undervolting: The following undervolting settings have been applied to optimize performance and temperature control:

CPU (0): -110.35 mV

GPU (1): -70.31 mV

CPU Cache (2): -110.35 mV

System Agent (3): -35.16 mV

Analog I/O (4): -35.16 mV

These adjustments help reduce power consumption and temperature while maintaining system stability for casual gaming.