Not sure if it's related to 5.5, that is what we're running. But if we go to edit a taxonomy term (say... update the description). It's been taking a long time. Some investigation reveals that it's associated with the number of posts associated with the term, about a second per 1,000 posts. And if I have a term with more than like... 40,000 associated posts, after a minute of loading, I get the "There has been a critical error on your website" error. Investigating that revealed that it ran out of memory.

Increasing the memory to 512MB "fixed" the problem. But it really feels like when the task is "Add a period to the end of that taxonomy term description"... to require 512MB to do that seems excessive.

Has anyone else seen anything like this?