Setup FPS limit and performance and metrics overlay

Hi again

I'm struggling with setting up mangohud now (or really any FPS limiter and performance overlay). Specifically, I can't limit my FPS or display my FPS (and other metrics) to even know what it is.

Any pointers? I've tried:

• Followed the mangohud install steps on github. I didn't install one of those demos because I needed to compile from source but I couldn't find any explicit tutorial or makefile..
• Tried switching between several Proton versions (GE just doesn't work for me I found)
• Tried a billion different ways to run it like with "mangohud" prefix and with variables. Nothing. I think gamescope also doesn't work, I'm not sure.
• Watched several Youtube videos about Mangohud and Goverlay, they weren't really useful.
• Tried Medal Of Honor Airborne on Lutris (local install)
• Tried Webbed on Steam (via steam install)
• Tried heaven benchmark (installed via their .run file)
• The FPS limit switch hotkey (shift F1) works on the goverlay demo cube thing
• The HUD toggle hotkey (shift F12) works on the goverlay demo

More screenshots with various things I tried:

I've been trying this for probably close to 12 hours...Idk what to try anymore :-/

I'm on Linux Mint 22.2, Cinnamon 6.4.8. The laptop is a Thinkpad T470p.

Not sure if this is the right community for this, lmk.