For me performance is poor, it's unplayable. To run the game, I had to turn on Chrome's enable-unsafe-webgpu setting.
It's odd, it worked flawlessly on a M2 Macbook air running Firefox. I usually have to switch to Chrome for anything fancier than just browsing.
For comparison, I get a perfect frame rate on an iPhone 14.
Whatever computer you’re using must be slower than a 4 year old phone.
For me it worked fine - even on an iPhone running Safari