1.2.4
It seems there was an issue in one of the merges from Dec 2023 that added conversions. This removed the benefit of the SaveOnConfigSet that is inside the manager. This made your configs save for each new piece and...save twice. Where, previously this would only save once for the entire configuration file once all configs have been generated. Thank you to Margmas for digging more into the recent game loading issues that we pressumed Ashlands introduced. They did make initial loading worse, but luckily it exposed this issue that's been around for 6 months!
TLDR; If you have a mod that adds a lot of pieces, it is highly recommended that you update your internal PieceManager. If your mod adds only a few, the benefit is still there, but might not be as noticeable. Load times will be sped up drastically for those with bigger mods.
Full Changelog: 1.2.3...1.2.4