Thanks for playing, sorry for inconvinience, this is bug you encountered. I have tried experimental WebGPU build inside Unity. I tried it because I was using VFX Graph on GPU. But I think there is something different wrong there. Could you tell me what is your computer specs? You need a little bit beefy computer because of too much going on. Also could you try those demos, how much performance do you get from these?: https://www.keijiro.tokyo/WebGPU-Test/
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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.