Over here, at least, a lot of the time is spent just waiting for content. Even static content from CDNs. I'm guessing they're not geolocating properly.
9s to load that page.
3s just for `jira/software/c/projects/HV/issues/?filter=allissues`, which is 194 lines of HTML (with some scripts) but the bulk of the 3s is just content loading.