F-droid Firefox navigation super slow since last update

Has anyone experienced this? Using my mom's comcast wifi when I navigate to a new site the navigation takes a very long time, like a full minute. Once it eventually completes, I can click around inside the site at normal speed. This only happens with Firefox (I tried installing the Duckduckgo browser and it doesn't have the problem). It only happens on the comcast wifi (switching to mobile internet makes it go away). Using my laptop on the same wifi network has no problem. The issue on Android only started with the last update on F-droid. The only extension installed is ublock origin.

I can make some useless guesses at what might be happening (DNS queries getting hung somehow) but haven't made any attempt to check them with network sniffing.

Has anyone else experienced this?