I am aiming at 60 FPS, but I am struggling to keep it at any settings.

I have performance UI brought up, and I have noticed this. Presets:

• Ultra -> ~30FPS average, 90% GPU usage, 40% CPU, 65°C
• High -> ~45FPS average, 80% GPU usage, 30% CPU, 60°C
• Medium -> ~50FPS average, 40% GPU usage, 30% CPU, 50°C
• Low -> ~50FPS average, 20% GPU usage, 20% CPU, 40°C

As you can see, I cannot reach 60 FPS in-game even at the lowest preset.

What can I check/do in this case? The Linux binary is being used.