@freemo thanks for the heads-up!
As I only recently joined I assumed that was normal performance for the browser portal and mostly stuck to the app.
On inspection it seems the ticker theme causes repeated requests to https://miy.pw/ which times out with 503: Service Unavailable. This is indeed avoided by switching to a theme without a ticker as you say, such as `qoto-no-ticker`.
Hope other folks pick up on this and switch themes for themselves. In fact, I wonder, is it possible to remove the themes that do this to avoid the problem?