See the above. I'm using a custom world that was empty when it was created. I am using some households in it I moved from another town using Porter. No other issues are noticeable, but there is major lag when my save file is first loaded.

Hi there. Could be mistaken, but that looks like a debug log on the Careers mod to me. On City Hall or an in-game computer, check NRaas > Careers > Show Debugging. It should always be False unless a developer has requested a brief run with it on in order to examine the resulting log for some reason. The game will lag with debugging logs on as they take a lot of resources to produce.

You have a bad career installed, Nekocat.Pirate.

Okay, thanks for pointing out the problem career! I installed some custom careers not too long ago, and I wasn't sure which one was causing the popup.