Is it? I am in the middle of the page, the header and footer are well off into the distance not being rendered, and I see the same pattern.

https://imgur.com/texxYP0

Zoom in, take a look at what code is running, and you'll see it's all `lottie_light.min.js`. Being offscreen doesn't mean it's doing nothing. In fact, it looks like once it shows once it keeps spinning its RAF loop forever. Shrink your window so it disappears, reload, and then profile.