Great question! The boost can be explained by JS vs. raw HTML+CSS performance.

In the past, we sent a dummy loading screen but we then had to download tons of JS + run that to even show a "real" loading screen (i.e. page-specific loading screen).

Now, the HTML response (which you can inspect yourself, `curl https://my.causal.app`) already has a skeleton of the page, which doesn't need any JS to download and run before showing the "real" loading screen.

The UX is better because users spend noticeably less time staring at a blank screen and there's much less layout shift too!