Lua error pop up only in delves and visions

Every time I run a delve or vision, I get a popup saying that my addons are slowing down the game (it is not, it’s fine), and no matter what I do, it won’t go away.

This ONLY happens in delves and dungeons, it does not happen in the open world, raids, or dungeons (m+ included).

I’d suggest disabling add-ons until you find the culprit. It may not be immediately apparent that the game is having issues, but clearly something is triggering the alert and it’s probably good to find out what it is.