I have some additional observations - I'm trying to reply to replies in this thread and it just hangs indefinitely whereas I was able to respond directly to a newer post (and here) with only a few seconds of latency.
So this is a specific bug (at least in my case) and not expected latency. I'll see if I can't capture a har for y'all.
No request actually gets sent for the reply so that's fun. Did get a couple of 304s back but figured they were inconsequential, but can send a file anyway. Do y'all have a support email?
Note this chart is partly wrong because of the current spam bot crisis