Just to clarify, this happened right after hitting the "RIDE" button, not during the initial Godot loading screen.
I tested it again, and this time it ran super smoothly—probably because it loaded from the browser cache.
However, when I tried a different browser, there was about a 10-second delay after clicking "RIDE," and by the time it loaded, the horse was already mid-run! Just wanted to pass this along as a reference.