Compatibility Report

• Name of the game with compatibility issues: Sid Meier’s Civilization VI
• Steam AppID of the game: 289070

System Information

• GPU: AMD Radeon RX 6800 XT
• Video driver version: Mesa 23.1.5
• Kernel version: 6.1.44-1-MANJARO (also tried 6.4)
• Link to full system information report as Gist
• Proton version: Experimental or 8.0-3

I confirm:

• [X] that I haven't found an existing compatibility report for this game.
• [X] that I have checked whether there are updates for my system available.

Symptoms

With proton 7, 8 or experimental, my online FPS tanks, going up and down between 5 and 20. Using 6.3-8 I don't have this issue, a steady 100+. Offline play doesn't have this issue, works flawlessly in all of these versions. Issue is already present when creating an internet game with only computer opponents.

Reproduction

Whether the issue is present can already be seen from the game creation lobby:

Multiplayer > Internet > Create Game > Confirm Settings

with newer versions of proton my FPS is at 30 or below here, the animated background is jittery. With 6.3-8 FPS is 60-70 and everything is smooth. Actually proceeding to in-game the FPS will be even worse.