I'm running it on Firefox, on Windows 10.
Based on other responses, I'm assuming this doesn't happen for everyone, so if it's just me, feel free to ignore. Just putting it out there in case you'd like to investigate.
Also using Firefox on Windows 10.
Ping tester says somewhere between 50 and 75ms to Amazon's Virginia center.
Yeah, I saw on another comment that you're apparently running this with SSR, which is pretty crazy, to me! I'm surprised it's as snappy as it is, honestly, but the lag makes a lot of sense, now.
Also shocked that you'd want to incur that much bandwidth cost - assuming you're being charged for it. Something like this should be able to run in the client effortlessly, so I would think even experimenting with SSR, you'd want to do most of the processing client side and then just dribble in the server re-renders, for more batched processing.
In any case, good job! Definitely does the thing you set out to do with it, and is a clear demonstration of SSRs capabilities (and current weaknesses).