I'm playing on a pretty beefy computer, I played the game with an RTX 4070 laptop gpu, 32GB ram, and AMD Ryzen 9 7940HX. It may also partly be due to my internet because I'm not at home and my internet isnt doing that great. Other games do run fine so I don't think this has that much impact.
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I cant tell anything without inspecting your computer but I believe instead of Nvidia GPU it uses AMD GPU for browser hardware acceleration. I have RTX3060, Ryzen5 3600 and 16GB RAM, worse than your specs. It is really strange that you get 3fps on fullscreen, I get V-Sync 60fps. I don't think internet is a problem but like I said I am not sure, this is experimental graphics at the end. You might ask why am I obsessed with that, cuz I want to push how far can I go with WebGPU. Thanks again for taking your time, and sorry again for inconvinience.