Same here since -1211 update. The difference is significant and found myself having to reboot 2-3 times a day just to have useable playback. I reported this back in Feb when this release was made Roon became noticeably slower with latest 2.0 (build 1211) upgrade - large library. I also noted several others reporting issues with this update.
Ever since updated with the -1211 and subsequent releases have been “noticeable” / “painful” slow to the point of becoming unusable.