I can't tell why, but I'm getting terrible performance on Linux/Brave. The CPU spikes immediately on visit. I'm on a powerful machine (32 GiB RAM, Intel i9 w/ 24 cores).
I encountered similar trouble with both Firefox and Chrome on Ubuntu.
Based on a quick Firefox performance report on the minified source code, most of the time seems to be spent in functionality looking like frame handling. There are some signs of time calculations.
One educated guess would be that something in frame time calculations goes off, possibly due to restricted time resolution to prevent timing related fingerprinting. This would cause next frame computation to start immediately instead of after the intended timeout.
Because any non-broken combination of browser and software platform can run this on any PC made this century. It runs fine on my terrible Atom Chromebook, even.
