Yet performance is abysmal. I clicked on “API reference” and nothing happened for a second. Then the submenu opened in the sidebar. Another second later the content view updated. There is no indication of anything loading, there are no network requests to await. Incredibly, it’s dog slow on an M1 Mac.

If the viewport is 800 px or narrower, click on the menu icon (horizontal bars, top right), then click on a sidebar link. Do that a few times, you’ll notice it’s incredibly slow to react. Same with resizing the viewport, very sluggish.