I tested this on multiple browsers and systems. Our All/Hot has been like this for 2 days. If I leave it long enough, multiple minutes it will sometimes load a bunch more and get stuck in weird update cascade that will use up all my RAM.
None of the other instances I tried have this issue. It seems to happen whether I'm logged in or not.
Got an answer from TheDude on matrix chat. That is a known issue fixed in 0.18, but some instances are using the untested patch to fix it until then. He doesn't want to roll out untested code with potential side-effects, so we're stuck with the issue until it comes down the pipe.
Ah, that explains a lot. Thank you.
A solid choice, IMO. Good to wait for releases rather than roll your own unless you have a VERY good reason to.