Well, the website is actually pretty nice, maybe it's time for you to get a modern browser.
Even so, the website is just static content basically (except the globe at the top that you can rotate) so requiring webgl for the entire website (or even JS) feels a bit too much. Could just have hidden the globe if webgl/js is not enabled.
I am on cutting edge chrome with a decent enough workstation and the site crashed my entire Chrome.
It's also quite large. 12MB. Odd choices, given who I expect to be interested in satellite internet. But its just tech porn right now after all.
Selling point ;) If you get starlink even the starlink website would load quickly!