I think whatever Javascript you made your AI write to do that is causing scrolling to be incredibly laggy on a phone and warm my entire device; Pixel 7a in Firefox.
edit: it's something you (Claude) are doing with text rendering. Zooming in on any text makes it exponentially worse.
It's obvious when you don't give a shit about design. It's extremely obvious when you lie about making something that a machine output when you don't give a shit about design yourself. Everybody sees this.