I'm having issues with lag, about 1 frame every other second lol. Is it just the web build? I'll try it on another browser too (using Chrome with Windows 10).
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We looked into this a bit more and it looks like this might be an issue with integrated graphics card (which are very common in Laptops).
If you're playing on a Laptop, try looking for a "GPU Switch/Hybrid Mode" setting in your System Options (in our case it was MSI Center) and set the graphics mode to "Discrete". This will force the laptop to use the main GPU.