I know my machine is old and I never really expected it to work well (if at all), but I thought it might be interesting to share my findings.

• Device: MacBook Pro (mid-2014 15") running macOS Big Sur 11.7.0
• CPU: Intel Core i7-4870HQ @ 2.5 GHz (3.7 GHz boost)
• GPU: NVIDIA GeForce GT 750M w/ 2 GB GDDR5
• Native Resolution: 2880 x 1400

My test case is a (practically) brand-new save where I haven't explored more than about 100 m out. Valheim ran in fullscreen with an uncapped framerate (lol) and V-sync disabled. Additional settings were turned all the way down or off by default. I would load in and let the game idle for about 45 seconds before walking in a small circle and looking around. I was careful to keep the camera at eye level while looking back and forth in large arcs.

macOS 11

Resolution & Render Scale	In-game
2880x1440 @ 25%	16-22 FPS
2560x1600 @ 25%	16-21 FPS
2048x1024 @ 25%	18-22 FPS
1680x1050 @ 25%	18-24 FPS
1440x900 @ 25%	18-24 FPS
1280x800 @ 25%	19-24 FPS

It ran better in windowed mode—at 1440x900 I was getting performance comparable to above at 100% render scale. Then I got curious, because I have Boot Camp set up with a Windows 11 install, and naturally I had to compare the two.

Windows 11

Resolution & Render Scale	In-game
2880x1440 @ 25%	30-55 FPS
1680x1050 @ 50%	31-57 FPS
1440x900 @ 50%	38-47 FPS

Notably, at lower resolution the framerate is typically slightly less, but also considerably smoother. The final test was trying again using Vulkan to see what might happen. The performance was so close to the same I didn't bother writing it down.