I've just reinstalled Windows and then reinstalled Lich, but my new Lich installation is running extremely sluggishly, and taking up a remarkable amount of available CPU ability. Logging into the game without Lich does not create the same lag. I'm running Windows 10 on a Lenovo laptop with a Core i3-7130U CPU @ 2.70 Ghz with a dual-core processor, an SSD, and 16G of RAM, which should be more than sufficient. Anyone have any thoughts for what might be interfering and how to fix it?
Edit: Eventually fixed this with a clean Windows reinstall.