I can't replicate it in private browsing. I'm not running any mobile extensions and my internet is as good as it comes. First time I loaded it the blue line at the top was there for ages. I was scrolling the site for a good 20 secs marvelling at the irony of a site teaching performance not performing. It felt like something to do with the service worker not working. The cookie notice only appeared after I refreshed. Now it works fine, and loads fine each time. So it was something to do with the initial caching of assets.

And yes, the accessibility section coming soon sends the wrong message very subtly but powerfully. It's something we all need to be better at, and when you've got the resources of Google there just isn't any excuse. Those two small words on that missing section quietly absolve us all. Because if Google can't do it right, why should we? It just isn't good enough, so yes, they have let themselves and our community down. I know they're strong words, but someone needed to say it.