Same situation. A few years ago I started moving old emails into yearly sub folders (just moved all of last years emails into a “2022” folder). This improved pe

Same situation. A few years ago I started moving old emails into yearly sub folders (just moved all of last years emails into a “2022” folder). This improved performance a lot for me. I’m guessing the smaller folders of emails keep the index files small. Search still works through all of those folders.